Develop Reference

Creating Responsive Slide Up Menu

Hoping for a little guidance. I'm making a "slide up" menu for a site i'm using and I have it working, except it's not responsive. Ideally, i'd like to have it so whatever I put in the content under "Book Now" would be hidden no matter the size, while keeping "Book Now" shown.
The way I have it set up now, I have to be very verbose about heights, and it doesn't seem to really want to work on mobile.
Hoping you kind folks could point me in the right direction of what CSS I actually need to make this work!
Here is the JSFiddle:
https://jsfiddle.net/yg13exft/
<style>
/* footer fixed Menu stuff */
.bottomNav{
overflow: hidden;
position: fixed;
bottom: -210px;
width: 100%;
transition: all .7s ease-in-out;
z-index: 9999;
}
.tipBar{
text-align: center;
transition: all .7s ease-in-out;
}
.tipBar a{
color: #6c0505;
background: orange;
display: inline-block;
padding: 5px 15px 5px 15px;
}
.menuBar{
background-color: #6c0505;
display: grid;
grid-template-columns: auto auto;
justify-content: center;
padding-top: 10px;
height: 100%;
}
.bottomNav p{
color: black;
}
.displayNone{
display: none;
}
.tipToggleAnim{
bottom: 46px;
}
.bottomMenuAnim{
bottom: 0;
}
.rightCol img{
max-height: 200px;
}
</style>
<div class="bottomNav" id="bottomNav">
<div class="tipBar" id="tipBar">
<a id="bookNowButton" class="animate__animated animate__backInUp">
Book Now!
</a>
</div>
<div id="dialog" class="menuBar" >
<div class="leftCol">
<p>
TEST TEXT HERE! :)
</p>
</div>
<div class="rightCol">
<img src="https://images.unsplash.com/photo-1589883661923-6476cb0ae9f2?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1374&q=80" alt="cat">
</div>
</div>
</div>
<script>
let toggledVar = false;
function popupMenu(){
let menuToggle = document.getElementById("bottomNav");
let divButton = document.getElementById("tipBar");
if (toggledVar == true){
toggledVar = !toggledVar;
menuToggle.classList.remove('bottomMenuAnim');
}
else {
toggledVar = !toggledVar;
menuToggle.classList.add('bottomMenuAnim');
}
}
let buttonTest = document.getElementById("bookNowButton");
buttonTest.addEventListener("click", popupMenu, false);
</script>
Thank you.

I would use clientHeight to get the height of the dialog section and then set that as the bottom attribute so it will always be hidden. That way no matter what the height of the content, it will always know how many pixels to set bottom to and hide the div, but keep the Book Now showing.
There is a window load event because we need the DOM to fully load before we retrieve dialog div height.
Then, we use animate to smooth the change of the bottom attribute. Animate takes two parameters, the keyframes and the options. In the options, fill makes the animation run and stay in its end state. You can adjust the duration to fit your liking.
// We wait for the page to fully load, then we can grab the height of the div
window.addEventListener('load', function() {
// Toggle boolean
let toggledVar = false;
// Set toggle to Book now button
let menuToggle = document.getElementById("bookNowButton");
// Get bottomNav section
let bottomNav = document.getElementById("bottomNav");
// Get the height of the div
let hiddenSection = document.getElementById("dialog").clientHeight;
// Set bottom css attribute
bottomNav.style.bottom = `-${hiddenSection}px`;
function popupMenu(){
if (toggledVar == false) {
// Set bottom css attribute to 0px to reveal it
bottomNav.animate([
// keyframes
{ bottom: `-${hiddenSection}px` },
{ bottom: '0px' }
], {
duration: 1000,
fill: 'forwards'
});
toggledVar = true;
} else {
// Set bottom css attribute to hide it
bottomNav.animate([
// keyframes
{ bottom: '0px' },
{ bottom: `-${hiddenSection}px` }
], {
duration: 1000,
fill: 'forwards'
});
toggledVar = false;
}
}
menuToggle.addEventListener('click', popupMenu);
});
* {
box-sizing: border-box;
}
html, body {
padding: 0;
margin: 0;
width: 100%;
min-height: 100vh;
}
#bottomNav {
max-width: 100%;
position: fixed;
overflow: hidden;
left: 0px;
}
#bookNowButton {
display: block;
margin: 0 auto;
text-align: center;
padding: 1rem;
max-width: 200px;
background-color: yellow;
cursor: pointer;
}
#dialog {
background-color: #6c0505;
display: grid;
grid-template-columns: repeat(2, 1fr);
grid-gap: 1rem;
padding: 1rem;
}
.rightCol img {
max-width: 100%;
}
<div id="bottomNav">
<span id="bookNowButton">Book Now!</span>
<div id="dialog">
<div class="leftCol">
<p>
TEST TEXT HERE! :)
</p>
</div>
<div class="rightCol">
<img src="https://images.unsplash.com/photo-1589883661923-6476cb0ae9f2?ixlib=rb-1.2.1&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1374&q=80" alt="cat">
</div>
</div>
</div>

Using CSS Transitions on Auto Height Dimensions

I'm making a collapsible panel and the issue is with the [data-panel] not keeping the css transition when it's set to height: 100%. it works fine for fixed height i.e. height: 150px , but it's important to keep height dynamic since I don't know the available space of the content inside. i'd prefer not modifying the html or js but i'm open to suggestions...
Codepen: issue on line 44 in css
https://codepen.io/oneezy/pen/bGBpXaW
function activeLinks() {
document.addEventListener('click', e => {
let linkEl = e.target.closest('[data-link]');
if (linkEl) {
let url = linkEl.dataset.link;
let linkEls = document.querySelectorAll('[data-link]');
let ActivelinkEls = document.querySelectorAll(`[data-link="${url}"]`);
// remove "active" class from all links
Array.from(linkEls).forEach( (el) => {
el.classList.remove('active');
});
// add "active" class to all matching links
Array.from(ActivelinkEls).forEach( (el) => {
let prevLink = el.parentElement.previousElementSibling;
let prevPrevLink = el.parentElement.parentElement.previousElementSibling;
el.classList.add('active');
if (prevLink && prevLink.dataset.link) {
prevLink.classList.add('active');
prevLink.parentElement.classList.add('active');
}
if (prevPrevLink && prevPrevLink.dataset.link) {
prevPrevLink.classList.add('active');
prevPrevLink.parentElement.classList.add('active');
}
});
}
});
}
activeLinks();
/* Reset
*********************************/
* { margin: 0; padding: 0; box-sizing: border-box; font-family: roboto; }
html, body { height: 100%; overflow-x: hidden; }
a { text-decoration: none; display: block; }
/* Layout
*********************************/
#page { display: grid; grid-template-columns: 160px 1fr; gap: 3rem; height: 100%; }
#nav { background: black; display: block; align-items: start; align-content: start; justify-content: stretch; padding: 2rem 1rem; }
#main { display: flex; justify-content: space-around; padding: 2rem 5rem 0 0; }
/* Navigation
*********************************/
/* Sections */
#nav .link-level__one { margin: 1rem 0; }
#nav .link-level__two { }
#nav .link-level__three { position: relative; }
#nav .link-level__three::after { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px; width: 100%; background: gray; }
/* Links */
#nav .link-level__one a { padding: .25rem .5rem; color: gray; font-weight: 900; }
#nav .link-level__one a.active { color: white; }
#nav .link-level__two a { padding: .25rem .5rem; color: gray; font-weight: normal; }
#nav .link-level__two a.active { color: white; }
#nav .link-level__three a { padding: .25rem .5rem; color: gray; }
#nav .link-level__three a.active { color: white; font-weight: normal; }
/* Main
*********************************/
#main section { }
#main a { color: black; padding: 1rem .5rem; }
#main a.active { background: blue; color: white; }
/* Panel
*********************************/
[data-panel] { height: 0; overflow: hidden; transition: .22s .22s ease-in-out; }
.active ~ [data-panel] { height: 150px; } /* I NEED THIS TO BE DYNAMIC HEIGHT! */
<div id="page">
<nav id="nav">
<!-- LINK 1
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
<!-- LEVEL 1 -->
<section class="navigation-links__wrapper link-level__one">
Link 1
<!-- LEVEL 2 -->
<section class="link-level__two" data-panel>
Link 1a
<!-- LEVEL 3 -->
<section class="link-level__three" data-panel>
Link 1a-1
Link 1a-2
Link 1a-3
</section>
</section>
</section>
<!-- LINK 2
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
<!-- LEVEL 1 -->
<section class="navigation-links__wrapper link-level__one">
Link 2
<!-- LEVEL 2 -->
<section class="link-level__two" data-panel>
Link 2a
<!-- LEVEL 3 -->
<section class="link-level__three" data-panel>
Link 2a-1
Link 2a-2
Link 2a-3
</section>
</section>
</section>
<!-- LINK 3
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
<!-- LEVEL 1 -->
<section class="navigation-links__wrapper link-level__one">
Link 3
<!-- LEVEL 2 -->
<section class="link-level__two" data-panel>
Link 3a
<!-- LEVEL 3 -->
<section class="link-level__three" data-panel>
Link 3a-1
Link 3a-2
Link 3a-3
</section>
</section>
</section>
</nav>
<main id="main">
<section>
<h2>Link Level 1</h2>
Link 1
Link 2
Link 3
</section>
<section>
<h2>Link Level 2</h2>
Link 1a
Link 2a
Link 3a
</section>
<section>
<h2>Link Level 3</h2>
Link 1a-1
Link 1a-2
Link 1a-3
Link 2a-1
Link 2a-2
Link 2a-3
Link 3a-1
Link 3a-2
Link 3a-3
</section>
</main>
</div>

It's a duplicate question that has been answered here:
How can I transition height: 0; to height: auto; using CSS?
You can use a max-height greater than it will ever be to accomplish this.
#menu #list {
max-height: 0;
transition: max-height 1s ease-out;
overflow: hidden;
background: #d5d5d5;
}
#menu:hover #list {
max-height: 1000px;
transition: max-height 1s ease-in;
}

I've somewhat came up with a solution I'm proud of; however, it's not perfect. The main trick in getting this to work was giving the [data-panel] a line-height: 0 and transitioning it when it becomes active (THE LINE-HEIGHT ONLY). Also you'll need to make sure the contents of the [data-panel] don't have any margin or padding (until the panel becomes active) or it will completely throw off the UI.
https://codepen.io/oneezy/pen/bGBBEmp
/* Panel
*********************************/
[data-panel] {
overflow: hidden;
line-height: 0;
opacity: 0;
pointer-events: none;
transition: line-height .22s ease-in-out;
}
.active + [data-panel] {
line-height: 1.4;
opacity: 1;
pointer-events: auto;
}
I'm answering my own question; however, I'm not accepting it as the chosen answer. I'd love to see more unique solutions added to this thread.

The short answer is that you can't. Height transitions will only work on elements that use a unit based value for their height property.
Here's an article detailing different techniques to achieve the same outcome: https://css-tricks.com/using-css-transitions-auto-dimensions/

Background doesn't repeat to the left

Im trying to do a slider menu, i have a div with a tape background, all is working fine when it's animating to the left by the background-repeat, but when it is animating to the right and it get to the left border of the background it get disappears because background-repeat doesn't repeat to the left, just to the right.. There's way to make the background repeat to the left?
And the list inside the "slider" div doesn't move at the same velocity of "slider" div
Here is the HTML code
<!DOCTYPE html>
<html>
<head>
<title>Prueba</title>
<link type = "text/css" rel = "stylesheet" href = "PruebaIndex.css">
<script type = "text/javascript" src = "jquery-2.1.4.js"></script>
<script>
$(document).ready(function(){
var mode = 0; // 0 Left - 1 Right
autoSlider();
function autoSlider(){
mode = 0;
$("#slider").animate({left: "-=60px", width: "+=60px"}, 'slow', 'linear', autoSlider);
}
function slideLeft(){
mode = 1;
$("#slider").animate({left: "+=60px", width: "-=60px"}, 'slow', 'linear', slideLeft);
}
$("#slider").mouseover(function(){
$("#slider").stop();
});
$("#slider").mouseout(function(){
if(mode === 0)
autoSlider();
else
slideLeft();
});
$("#Left").mouseover(function(){
$("#slider").stop();
autoSlider();
});
$("#Right").mouseover(function(){
$("#slider").stop();
slideLeft();
});
});
</script>
</head>
<body>
<div id = "wrapper">
<div id = "slider">
<ul>
<li>1</li>
<li>2</li>
<li>3</li>
</ul>
</div>
<div id = "Left">
Left
</div>
<div id = "Right">
Right
</div>
</div>
</body>
</html>
And the CSS code
*{
padding: 0;
margin: 0;
}
#slider {
padding: 0;
left: 0px;
background-color: black;
background-image: url("http://s11.postimg.org/msh93rl8z/Tira_Fotografica.png");
background-repeat: repeat-x;
width: 800px;
height: 304px;
position: relative;
overflow: hidden;
}
#wrapper {
width: 800px;
height: 1000px;
margin: 0 auto;
text-align: center;
overflow: hidden;
}
#Left {
width: 100px;
height: 100px;
position: absolute;
color: white;
background-color: black;
margin-top: -200px;
margin-left: -100px;
}
#Right {
width: 100px;
height: 100px;
position: absolute;
color: white;
background-color: black;
margin-top: -200px;
margin-left: 800px;
}
#slider ul {
list-style: none;
}
#slider ul li {
display: inline-block;
width: 200px;
height: 200px;
position: relative;
background-color: white;
margin: 50px 10px 0px 0px;
}
I tried to put the code on JSFiddle but it doesn't run..
Sorry for my bad english

it works. see here: https://jsfiddle.net/cLv4hLfy/
take a look at the #slider element.
this values are annoying ;-)
<div style="left: -5863.5px; width: 6663.8px; overflow: hidden;" id="slider">
left is decreasing and width is getting bigger and bigger.
when the slider goes to the opposite direction left gets bigger and width convergates to 0px.
[EDIT]: so the background is not animated. the div is animated. what about fix the div and animate something in the div. you could do something also with background position when its repeated.

css tabs don't scroll in page's top

I've got this issue that i can't resolve myself.
I've got css tabs like in this site: http://www.sitepoint.com/css3-tabs-using-target-selector/
but i've got a fixed menu in the top of the page. So, when i click in one tab, the html navigate to the anchor that is under this menu and the content jump to top.
I want to scroll the content on top of the page, I've searched a lot, tried `$('body').scrollTop(0); what they said in this answer: Scroll to the top of the page using JavaScript/jQuery?
but nothing work. This is my code, HTML:
<body class="centered">
<div id="main-container">
<!-- header -->
<div class="col_1_of_1 blue header">
<div class="col_1_of_5 menu-icon">
<img src="img/menu.png">
</div>
<div class="col_3_of_5">
<p class="main_title" id="headerTitle"></p>
</div>
<div class="col_1_of_5 img-icon">
<img src="*">
</div>
</div>
<!-- body -->
<div class="body" id="list">
<article class='tabs'>
<section id='tab1'>
<h2><a href='#tab1' id='sayit'>Person1</a></h2>
<div class='col_1_of_1'>
<img src='img/bike/img.png'>
</div>
<div class='col_1_of_1'>
<p class='fausto_title'>dscdsvdvds</p>
<p class='fausto_text'>vdlisvd shvgldk sgvds gvgsd kjbvds ds uidshiu diui guig uig uig g g gl ffyolg f f h hj lhfh ff yfyufolyf uhyf <p>
</div>
</section>
<section id='tab2'>
<h2><a href='#tab2'>John</a></h2>
<div class='col_1_of_1'>
<img src='img/moto/img2.png'>
</div>
<div class='col_1_of_1'>
<p class='fausto_title'>dcdsdvdvds </p>
<p class='fausto_text'>dsvdvdhvihiu ugig piogv hgho ghvh vhvhv hvo vohv hovhjvhjvhvh vhvvhv vhvh vhvhv hv hjvp8ythtuy ty tygt gtg68g 6g 6g 6g tg tr gytrg <p>
</div>
</section>
</article>
</div> <!-- end body -->
</div>
CSS:
tabs.css
/* --- container's width --- */
article.tabs
{
position: relative;
display: block;
width: 100%;
}
article.tabs section
{
position: absolute;
top: 1.8em;
left: 0;
height: 12em;
background-color: #ddd;
z-index: 0;
width: 100%;
}
article.tabs section .table {
display: none;
}
article.tabs section:first-child
{
z-index: 1;
}
article.tabs section h2
{
position: absolute;
font-size: 1em;
font-weight: normal;
width: 33%;
height: 1.8em;
top: -1.8em;
padding: 0;
margin: 0;
color: #999;
background-color: #ddd;
border-top: 1px solid #ddd;
}
article.tabs section:nth-child(2) h2
{
left: 33%;
}
article.tabs section:nth-child(3) h2
{
left: 66%;
}
article.tabs section h2 a
{
display: block;
width: 100%;
line-height: 1.8em;
text-align: center;
text-decoration: none;
color: inherit;
outline: 0 none;
}
/* --- active section --- */
article.tabs section:target,
article.tabs section:target h2
{
background-color: #fff;
z-index: 2;
}
article.tabs section:target {
width: 100%;
position: absolute;
top: 1.8em;
left: 0;
height: 12em;
}
article.tabs section:target h2 {
width: 33%;
border-right: 1px solid rgb(27,47,105);
border-left: 1px solid rgb(27,47,105);
border-top: 1px solid rgb(27,47,105);
color: rgb(27,47,105);
}
article.tabs section:target .table{
display: block;
}
/* --- transition effect --- */
article.tabs section,
article.tabs section h2
{
-webkit-transition: all 500ms ease;
-moz-transition: all 500ms ease;
-ms-transition: all 500ms ease;
-o-transition: all 500ms ease;
transition: all 500ms ease;
}
menu.css:
.menu-icon {
padding-top: 9% !important;
}
.menu-icon img {
width: 40%;
}
.header {
position: fixed;
height: 64px;
top: 0;
z-index: 1000;
}
.header div {
float: left;
padding-top: 8%;
}
Thanks in advice for any help!
EDIT:
This is a phonegap application and i'm compling in iOS just now. It seems like the command scrollTop isn't recognize.
I'm using zepto.js, a jQuery like library but much faster.
EDIT 2:
Zepto.js / jQuery:
function clickButton()
{
document.getElementById('sayit').click();
return true;
}
$(function() {
//..other code (nothing to do with tabs)
//simulate the first click on a tab
clickButton();
$('a').on('click', function(event){
var anchor = $(this);
alert($(anchor.attr('href')).offset().top);
$('html, body').stop().animate({
scrollTop: $(anchor.attr('href')).offset().top
}, 100);
event.preventDefault();
});
});

Add the class .tab to your tab links.
<h2><a href='#tab1' id='sayit' class='tab'>Person1</a></h2>
Include jQuery in the <head> of your page:
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
Bind a click event to tabs that scrolls the page to the top:
$('.tab').click(function(event) {
event.preventDefault(); //Prevent the link from jumping.
$('html,body').animate({scrollTop:0}, 400); //Scroll to top
});

Try this :
JS :
//To scroll top of the Tab
$(function() {
$('a').bind('click',function(event){
var $anchor = $(this);
$('html, body').stop().animate({
scrollTop: $($anchor.attr('href')).offset().top
}, 1000);
event.preventDefault();
});
});
HTML :
<div class="col_1_of_5 img-icon">
<img src="*" alt="TOP"/>
</div>
Also, I added Anchor tag over the image which shows the Top arrow.
DEMO HERE
Kindly reply if your are able to figure it out.

div popup not working

What I am doing wrong?
When you click on class divtop, it should show a div popup in the middle of the page. At that time back page should become not clickable. escape or a button in popup will close it.
<html lang="en" class=" en">
<head>
<title>My Test Popup</title>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<style type="text/css">
.divtop
{
width: 800px;
height: 300px;
border:solid;
}
.divbottom
{
top: 400px;
}
.localmenu {
border: 1px solid black;
background: #fff;
margin-left : auto;
top: 50px; width: 300px;
padding-top: 25px;
margin-top: 100px;
height: 150px;
}
.appContent{
width: 800px;
border:solid;
height: 600px;
display: block;
margin-left: auto;
margin-right: auto;
}
.maincontent{
width: 100%;
}
</style>
</head>
<body>
<div class="appContent" >
<div class="maincontent" >
<div class="divtop" >Top</div>
<div class="divtop divbottom" >Bottom</div>
</div>
<div id="popup" style="width : 100%; height: 600px;display: none;">
<div class='localmenu'>
Text in Div Popup<br/>
<button id="btnHide">Close</button><br/>
</div>
</div>
</div>
<script>
$(document).ready(function() {
$('.divtop').click(function() {
$('#popup').show().css("top", "500px").animate({top: 50}, 200);
$('.mainContent').css("background-color", "grey");
});
$('#btnHide').click(function() {
$('#popup').hide();
});
});
</script>
</body>
</html>

Fiddle
I added some CSS to your #popup and it's now all in the CSS (not inline in the html). Changed also your jQuery animate to 50px, instead of just 50.
I think you have small adjustments to do to the CSS, like in .localmenu I'm not sure why you have both padding-top: 25px; margin-top: 100px;.
CSS
#popup {
position:absolute;
display: none;
float: left;
left:30%;
z-index:1;
}
#popoverlay {
position: fixed;
display:none;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
opacity: 0.5;
}
jQuery
$(document).ready(function () {
$('.divtop').click(function () {
$('#popoverlay').show();
$('#popup').show().css("top", "500px").animate({
top: "50px"
}, 200);
$('.mainContent').css("background-color", "grey");
});
$('#btnHide').click(function () {
$('#popup').hide();
$('#popoverlay').hide();
});
});
HTML
<div class="appContent">
<div class="maincontent">
<div class="divtop">Top</div>
<div class="divtop divbottom">Bottom</div>
</div>
<div id="popup">
<div class='localmenu'>Text in Div Popup
<br/>
<button id="btnHide">Close</button>
<br/>
</div>
</div>
</div>

To get it to work properly, even if there is a vertical scroll bar, you have to use position "fixed". Place popup as a direct child of body and make it's position: fixed, and width and height 100%. Place localmenu as a direct child of body as well. Working example at jsbin.
Html:
<div id="popup">
<!--// This is to stop the user from interacting with the content in the back
// and to give a visual clue about that
-->
</div>
<div class='localmenu'>
<div>
Text in Div Popup<br/>
<button id="btnHide">Close</button><br/>
</div>
</div>
<div class="appContent" >
<div class="maincontent" >
<div class="divtop" >Top</div>
<div class="divtop divbottom" >Bottom</div>
</div>
</div>
CSS:
//Use opacity to give a visual clue. Please note that this doesn't work in -all- browsers
#popup {
position: fixed;
width: 100%;
height: 100%;
display: none;
background: black;
opacity: .5;
top: 0;
left: 0;
}
//This is just to be able to center the actual menu
.localmenu {
top: 20%;
left: 0;
width: 100%;
position: fixed;
height: 150px;
display: none;
}
.localmenu > div {
border: 1px solid blue;
background: #fff;
margin-left : auto;
margin-right: auto;
width: 300px;
height: 150px;
}
Javascript: (This is mostly the same, although I removed the animate, because I don't know exactly how it works and it needs to end at 'top: 0'. As localmenu and popup are seperate, we show them seperate as well.)
$(document).ready(function() {
$('.divtop').click(function() {
$('#popup').show().animate(200);
$('.localmenu').show();
//$('.mainContent').css("background-color", "grey");
});
$('#btnHide').click(function() {
$('#popup').hide();
$('.localmenu').hide();
});
});

To block the div tags at the back from being clickable:
Add a div with the following style in your HTML. Im gonna call it overlay.
.overlay {
width: 100%;
height: 100%;
background-color: #000;
left: 0;
opacity: .8;
position: absolute;
top: 0;
z-index: 10000;
display: none;
}
This will essentially cover up your page when shown up.
To center your popup:
I added some extra styles to #popup and removed some from .localmenu. You were missing position: absolute and z-index, added those in. (z-index of popup must be > z-index of overlay)
#popup {
background: #fff;
position :absolute;
left : 40%;
width : 300px;
height: 600px;
height: 150px;
display: none;
z-index: 10001;
}
.localmenu
{
border: 1px solid black;
}
Then, in your JS,
In your animate method, I changed 50px to 30% to center div#popup
Added code to hide and show .overlay along with #popup.
After the changes,
$(document).ready(function () {
$('.divtop').click(function () {
$('#popup').show().css("top", "500px").animate({
top: "30%"
}, 200);
$('.overlay').show();
});
$('#btnHide').click(function () {
$('#popup,.overlay').hide();
});
});
Demo
http://jsbin.com/olasog/1
Code
http://jsbin.com/olasog/1/edit

Try this:
$(document).ready(function() {
$('.divtop').click(function() {
var div = $('.appContent');
$('.localmenu').css({'margin': '200px auto'});
$('#popup').show().css({top: "500px", position: 'absolute', width: div.width(), height: div.height()}).animate({top: 0}, 200);
$('.mainContent').css("background-color", "grey");
});
$('#btnHide').click(function() {
$('.mainContent').css("background-color", "");
$('#popup').hide();
});
});