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Can someone explain this CSS code to me? [closed]

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I am trying to work on adjusting the size of a picture from a web page.
My friend wrote something, and I am trying to learn from it. What does this code do?
div.page-full-width div#primary div#content div.entry-content div#bbpress-forums div.bbp-reply-form form#new-post fieldset.bbp-form div p.bbp-attachments-form label.btn {
width: 9vw;
height: 1vw;
}
.entry-buddypress-content div#buddypress div.full-width div#item-body div.profile div#subnav {
width: 21vw !important;
height: 8vw !important;
padding-right: 2vw !important;
margin-bottom: 0;
}
#members-stream li .action div.generic-button a, #members-list li .action div.generic-button a {
font-size: 3vw;
line-height: 4vw;
}
some are #, some are . and some are div., how do they work to target specific lines from HTML code?

#foo selects the element with the id foo. (See MDN)
.bar selects all elements with the class bar. (See MDN)
More about CSS selectors in general.

.test is for classes in html
#test is for Ids in html
div. selectes all divs with this classname
Width: 9vw means view width so the image is 9% of the view width
He basically selected with this css a lot of Ids and Classes and gives them a height, width, distance inside(padding), distance outside(margin), font size and the line height(on which height the text should be displayed).
Hope this helps

How to remove spacing between the top of a border and a div [closed]

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I currently have a div that is displaying a chart. In my HTML page, I have given it the ID of "main". In my CSS, I am trying to bring the chart a bit more up in the page, however, have had issues. I currently have a border, and am trying to bring the chart up to the border. In other words, I won't want any padding/space between the div and the top of the border. This is how it looks like right now:
And here is how my CSS code looks like right now:
#main {
position:relative;
width:95%;
left:3%;
border: 3px solid green;
padding-top: 0px;
}
Any help would be appreciated. Thanks!

Try applying negative marging or negative top to your chart container...
Ex:
#main {
position:relative;
width:95%;
left:3%;
border: 3px solid green;
padding-top: 0px;
top:-20px
}
or
#main {
position:relative;
width:95%;
left:3%;
border: 3px solid green;
padding-top: 0px;
margin-top:-20px;
}

CSS Rectangle As links [closed]

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I have 3 rectangles that I've created with CSS. I want them to be clickable and link them to a file called "index.html". I've been searching over the web but could not find a way to do it. Is there also a way where hovering your mouse over the rectangle would just have the index.html file pop up but not open in a completely new window? Here is a snippet of what I have so far:
.rec
{
height: 100px;
width: 125px;
}
#d1
{
background : lightgreen;
border: 2px solid black;
display: inline-block;
left: 0%;
}
#r1
{
background : red;
border: 2px solid black;
display: inline-block;
left: 10%; position: relative;
}
#r3
{
background : white;
border: 2px solid black;
display: inline-block;
left: 20%; position: relative;
}

You should see JavaScript and jQuery tutorials. It's what, mostly, makes web pages interactive. Although in here, the best solution is clearly to use
<a href="index.html">
it would be good for you to learn them, and their incredible power. Check this fiddle here: http://jsfiddle.net/qjntjyyr/
As you can see, it's quite simple. In the next fiddle, I'm using an event for when the mouse goes over the squares.
http://jsfiddle.net/qjntjyyr/1/
Have fun with it, you can manipulate almost everything you want.

The clickable rectangles:
Index
Index
Index
As for the little box that appears when you hover them, you could use a title="" in the anchor tag, but that has the default styling the OS gives it. To customize one yourself you'd need JavaScript.

I found an interesting link to learn for your problem:css-trick
But the first answer is a good one to use.

Header menu height increases but nothing happens in HTML source code? [closed]

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I've a problem that this website's Header menu :
آسفالت
is increasing it's height . if you stay at website for about 2-3 minutes , header menu will become whole of your page and you need to scroll to see other content of website .
but i couldn't find any css rules that's doing this . also i didn't find anything in JS files .
What is the problem ?

I think the problem could be in the orbit slider code : at each slide the picture loses 2px in its height and the #header-outer div, that doesn't have an height property, seems to increase.
Without a sample code to try is really difficult to help you, but as workaround/solution, you can add an height property set to the initial height of #header-outer div (92px)
Your style.css entry should be like this (added height only)
#header-outer{
width: 100%;
top: 0px;
left: 0px;
position: fixed;
background-color: #FFF;
z-index: 9998;
box-shadow: 0px 0px 3px 0px rgba(0, 0, 0, 0.22);
padding: 28px 0px 0px;
overflow: visible !important;
height: 92px;
}

Padding Between "display:table-cell" [closed]

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Is there a way to place padding or a transparent border around the "cells" when one does display:table-cell? I would like the background to show up through this space, so I can't just set the border to white, and border-color:transparent doesn't work for me for some reason. I've checked w3schools and similar sites but I haven't been able to find this particular trait.
From user Praveen Vijayan: http://jsfiddle.net/geymU/

Use border-spacing: 10px on the parent container.
In your case
#nav ul{
display:table;
width:100%;
border-spacing: 10px;
}
You can also give top/bottom and left/right separately like border-spacing: 10px 20px;

The space between cells is controlled by the border-spacing and border-collapse properties in the table.
#nav ul {
display: table;
width: 100%;
background: yellow;
border-collapse: separate;
border-spacing: 12px 6px;
}