Develop Reference

How would I create a div container with three divs in a row where the divs on both sides expand away from the center when an event is triggered?

I want to create a div that has three nested divs touching each other in a row. I want the div at the center of this container to have a constant width. While I want the left div's width to expand to the left(i.e. not pushing the other two divs in the container to the right) on hover and stay expanded on click. I want the same thing to happen to right div's width except it expands to the right. All the nested divs would have content in them some of the content not completely visible until the div expands.
This would be the general idea:
When Neither is Hovered -->
enter image description here
When One Is Hovered -->
enter image description here
When They Are Both Clicked -->
enter image description here
The problem is I haven't been able to figure out a way to do this or find out if there is a tutorial or something that would be helpful in accomplishing this. I have tried googling how to create this, and in all honesty was not to sure exactly what to search up but nothing has really helped me get both divs expanding the way I want. I would appreciate any help in finding a tutorial or any implementation that might work.
So far I have been able to get this far in terms of coding it in HTML and CSS, but have been stuck for a while with no attempt being closer than this. I would need this to be on top of other elements on a page in my webpage hence the z-index, and positioning is so that I could move it to my desired place on the webpage. I am able to get the right div to expand how I want easily as that is the default behavior but when I try to get the left div and right div to both expand I have been stuck. I have gotten the left div to expand at one point but that led to the right div not working. So right now this is the closest I have gotten both expand properly but the left div is under the center div instead of beside it.
I added a bit of a yellow background in the images to give an idea of positioning
Result on Webpage No Hover -->
enter image description here
Result on Webpage On Hover Of Left Div-->
enter image description here
Result on Webpage On Hover Of Right Div-->
enter image description here
HTML-->
<div class="sliding-window">
<div class="left-wing">
</div>
<div class="middle-box">
<h3>Content</h3>
</div>
<div class="right-wing">
</div>
</div>
CSS-->
.sliding-window{
display: flex;
flex-direction: row;
/* justify-content: center; */
z-index: 25;
position: absolute;
top: 30%;
left: 35%;
width: 850px;
}
.middle-box{
left: 250px;
border: 1px red solid;
text-align: center;
height: 300px;
width: 250px;
border-radius: 10%;
background-color: grey;
}
.left-wing{
border: 1px violet solid;
height: 250px;
/* float: left; */
position: relative;
float: left;
left:200px;
margin-top: 25px;
margin-bottom: 25px;
width: 50px;
background-color: grey;
}
.right-wing{
left:450px;
border: 1px green solid;
height: 250px;
margin-top: 25px;
margin-bottom: 25px;
width: 50px;
background-color: grey;
}
.right-wing:hover{
width: 200px;
}
.left-wing:hover{
width: 200px;
/* margin-left: -200px; */
}

How to lower an image vertically on a webpage

I have been defeated attempting to figure out how to lower an image on a website.
I have seen lots of people simply doing .img {...} and editing it that way, the problem is that I have more than one img that is using that tag so if I edit it that way, it will affect all tags that utilize it, which is not what I want. Simply put, I have an image that is displaying near the top of my website and I would simply want it lower. For the class, here is the code:
.bichon{
display: block;
margin-left: auto;
margin-right: auto;
height: 300px;
width: 850px;
}
for my class and then for the image insert:
<img src = "https://upload.wikimedia.org/wikipedia/commons/thumb/9/93/Bichon_Fris%C3%A9_-_studdogbichon.jpg/1200px-Bichon_Fris%C3%A9_-_studdogbichon.jpg" class = "bichon">
The image is centered horizontally but I simply want to lower it a bit vertically so it's not overshadowing my navigation bar.
Thanks.

.bichon {
display: block;
margin: 50px auto 0;
height: 300px;
width: 850px;
}

You can give it a margin at the top. This will lower your image. I suggest make margin-top equal to the height of your navigation bar.
.bichon{
display: block;
margin-top: 80px; //the height of your navigation bar
margin-left: auto;
margin-right: auto;
height: 300px;
width: 850px;
}

Collapsible panel and space filling

I have a div which contains three more divs. The first one is a toolbar that can be collapsed (red in the example). It has a fixed height. The second one (black) has to fill all the remaining space, and must expand if the red one is collapsed. The third one (green) is in fact a button attached to the bottom of the red div. When the user clicks on it, it collapses or expands the red div.
<div id="container">
<div id="tools">
</div>
<div id="hider">
</div>
<div id="work-area">
</div>
</div>
I made an example on jsfiddle : https://jsfiddle.net/gpoa8s92/3/
I don't see how to make the black div take all the remaining space. I tried using a flexbox, and it works, but the green div isn't attached to the bottom of the red div anymore.
Is there a solution using ass less javascript as possible ?
Thank you !

I think your solution can be achieved with flexbox, just put tools and work area as siblings and for first set static height, flex-grow: 0 and flex shrink: 0, and for work area set height: 100%, flex-grow: 1 and flex shrink: 1.
This will make tools to occupy 100px and work area remaining place.
Since the toggle button is part of tools you can put it inside it, and move it outside using position: absolute and top: 100%, and give tools position: relative to stick toggle button to its bottom.
Now you can create a class for tools that set its height: 0 and animate it with CSS transitions.
Then on toggle button click, you can toggle a class on tools and it should be as you wanted.
Toggling tools height could be done without javascript- it would be a bit confusing but more accessible, here's an example of that: https://codepen.io/morganfeeney/pen/KiBty
Prepared an example for you - I've used BEM methodology for naming elements and cached used elements as variables.
const $toggleButton = $('.js-tools-toggle');
const $toggleContent = $('.js-tools-root');
const collapsedClass = 'tools--collapsed';
$toggleButton.on('click', function() {
$toggleContent.toggleClass(collapsedClass);
})
.container {
display: flex;
flex-direction: column;
height: 400px;
background-color: blue;
}
.tools {
transition: height 250ms ease-in-out;
position: relative;
display: flex;
flex-direction: column;
height: 100px;
}
.tools--collapsed {
height: 0px;
}
.tools__content {
height: 100%;
background-color: green;
overflow: hidden;
}
.tools__action {
position: absolute;
top: 100%;
left: 50%;
transform: translateX(-50%);
height: 20px;
background-color: red;
}
.work-area {
background-color: black;
flex: 1 1 auto;
height: 100%;
color: white;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<div class="tools js-tools-root">
<div class="tools__content"> Content of tools</div>
<div class="tools__action js-tools-toggle">
toggle
</div>
</div>
<div class="work-area">
content of work area
</div>
</div>

Keep image stationary, that's location is relative to nearby text

In the very middle of the screen I have a piece of text, along with an image. When the text gets longer, the image is forced to move the right, which is what its supposed to do. But what I want it to do, is keep the image in the same spot, and make the text shift over to the left instead.
(I will also be adding more names so I need this fix to be universal, not like manually changing it for each piece of text.)
(It might be hard to see, but its noticeable, and yes I'm using a template...)
My site - Updated link
I tried messing with the HTML to get the margin-right once the page is fully loaded, then when it updates the text change the margin-right to that, but it did absolutely nothing.
Any help is appreciated, I have no idea how to fix this issue.

What about this?
#banner .content {
display: inline-block;
margin-right: 1%;
max-width: 95%;
padding: 6em;
position: relative;
text-align: right;
vertical-align: middle;
z-index: 1;
float: left;
width: 66%;
}

You can solve this issue by defining the width property for the containing content layer, and then floating the image and the text to the right.
For example, if you want the right-hand side of the text to be aligned to the center of the page your image + it's left-hand margin needs to be half the width of the containing #banner .content layer.
With your image being 18rem square with a left-margin of 3rem your containing #banner .content div needs to be 42rem wide ((18 + 3) * 2).
#banner .content {
position: relative;
width: 42rem;
height: 18rem;
text-align: right;
vertical-align: middle;
/* center div.content */
margin: 0 auto;
clear: both;
display: block;
z-index: 1;
}
#banner .content .image {
width: 18em;
height: 18em;
border-radius: 100%;
vertical-align: middle;
margin-left: 3rem;
display: inline-block;
}
Content inside .content slides to the right with the span.image locked to its right-hand edge. As long as the text-container's width (header) does not exceed half the width of `.content' it will remain right-aligned 3rem from images left-hand side. Avoid using css-padding for positioning control and use css-margin properties instead.

How to keep my custom range/slider follower div perfectly centered with range thumb in Vanilla JavaScript

I've spent some time working on a slider that has a div follow the thumb of slider. I did this by creating a relatively positioned container for the follower (called #slider-follower-cntnr). I then adjust the position of the follower div (#slider-follower) according to the value of the range input. The problem is that as you move the thumb across the track the follower does not stay perfectly centered against the position of the thumb. I've tried adjusting the width of the #slider-follower-cntnr but I don't no how to find the correct width to keep it perfectly centered. Thanks for any help.
TL/DR: How can I keep follower div centered perfectly to the thumb of the range input across all range values?
Heres a codepen. You may need to full screen to see it get off center as you pull it along the range.
HTML
<div id="slider-cntnr">
<input type="range" id="frame-slider" oninput="updateFollowerValue(this.value)" />
<div id="slider-follow-cntnr">
<div id="slider-follow">
<div id="slider-val-cntnr">
<span id="slider-val"></span>
</div>
</div>
</div>
</div>
JS
var follower = document.getElementById('slider-follow');
var follower_val = document.getElementById('slider-val');
var slider = document.getElementById('frame-slider');
var updateFollowerValue = function(val) {
follower_val.innerHTML = val;
follower.style.left = (val*1) + '%';
};
updateFollowerValue(slider.value);
CSS
html, body {
width: 100%;
height: 100%;
}
#slider-cntnr {
width: 80%;
margin: 40px;
position: relative;
display: flex;
flex-direction: column;
background: orange;
}
#frame-slider {
width: 100%;
margin: 0;
}
#slider-follow-cntnr {
position: relative;
background-color: blue;
height: 10px;
margin: 0 auto;
width: 98%;
}
#slider-follow {
background-color: black;
width: 30px;
height: 50px;
display: flex;
justify-content: center;
align-items: center;
position: absolute;
margin-left: -15px;
}
#slider-val-cntnr {
background-color: white;
width: 25px;
height: 20px;
}
#slider-val {
margin-left: 9px;
}

Few ways you can fix this:
(1) In the HTML
<div id="slider-val-cntnr">
<center>
<span id="slider-val"></span>
</center>
</div>
(2) In the CSS
#slider-val {
margin-left: auto;
margin-right: auto;
}
(1) The HTML method probably works the best, but it's generally not best practice to have <center> tags throughout your HTML.
(2) This will make sure that the number never goes beyond the bounds of the white box that it resides in. If you don't care that it is absolutely centered, and just want the number to not exit the box, then this is a suitable solution.