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How do I Extend a Background Color the Full Height of a Div with CSS?

Last week I used CSS to tile a graphic across the whole width of a page. The purpose was to extend a header bar's color when the page scrolled right beyond the iniital viewport.

Now, with the same project I wanted to extend the left nav to the full height of the page. I couldn't use the same trick as you can't tile two separate background images.

This is still doable with some CSS. First, start the HTML Body:


We want the body to be the height of the view area:

body {
height : 100vh;

This sets the body to 100% height of the view area.

Now create our content wrapper div inside the body:

<div class="flex">

This code uses FlexBox for display:

.flex {
display : flex;
height : auto;
min-height : 100%;

It also contains a trick. The height is set to auto and the min-height is set to 100%. That, combined with the body's height of 100vh will extend this div through the full height of the page.

Finally, create our left nav bar inside our Flex div:

<div class="somebar">
Some Text and other things

This is styled with a specific width, but no specific height. I also specified the color

width : 150px;
color : white;

Check out the code here.

I've been doing a lot of HTML CSS work for a client, but I'm working on some longer programming based articles which will be coming out soon.

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