The height of the sidebar must be set to 100% in order to fully cover the

Take a look at the examples below.

// Content removed

.aside {
    position: relative;
    float: left;
    width: 195px;
    top: 0px;
    bottom: 0px;
    background-color: #ebddca;
    height: 100%;
}

Currently, I'm still searching for the right solution. I'm making progress though. The issue I'm facing is in my previous "Example #1", where a scrollbar appears on the right even with a small amount of code in the "main" section. I only want the scrollbar to show up when there is more code, similar to "Example #2".

cssheightsidebar

Answer №1

When setting the height of an element to 100%, it is important to also set the height of the body and html documents to 100%. The percentage is calculated based on the height of the generated box's containing block. If the height of the containing block is not explicitly specified and the element is not absolutely positioned, the value will compute to 'auto'. 

* {
  margin: 0;
  padding: 0;
  overflow: auto;
}
html,
body {
  height: 100%;
}
header,
footer,
article,
section,
hgroup,
nav,
figure {
  display: block
}
body {
  font-size: 1em;
  color: #fcfcfc;
  background-color: #f8f4eb;
  font-family: Verdana, Arial, Helvetica, sans-serif;
}
/*
 *  HTML5 Sections
 */

.header {
  height: 72px;
  margin: 0;
  padding: 0;
  background-color: #fff;
  overflow: hidden;
}
.nav {
  position: relative;
  height: 52px;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
.main {
  position: relative;
  height: 100%;
  background-color: #f8f4eb;
  overflow: hidden;
}
.aside {
  
  float: left;
  width: 195px;
 
  background-color: #ebddca;
  height: 100%;
}
<aside class="aside" id="asidecontainer">

  <div class="asidewrapper">

    <font color="#000">The background of this aside bar should be totally to the bottom of the page.</font>

  </div>
</aside>
<div id="asidehider" class="asideborder"></div>

<main class="main" id="main">

  <font color="#000">
        
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
        All the content goes here<br />
    
    </font>

</main>

Answer №2

Ensure that your <aside> and <main> elements are nested within a parent container that is styled as a flexbox with aligned items. Remember to tidy up the css classes for aside and main as well. Check out this codepen demo for reference.

Answer №3

To implement this style, make sure to apply the following class.

.sidebar {
  position: absolute;
  left: 0;
  width: 200px;
  top: 0;
  bottom: 0;
  background-color: #f0e5d3;
  height: 100vh;
}

It's crucial to utilize 100vh instead of 100%

Answer №4

Make sure to only include height:100px in the body and html elements.

Issue
Avoid using height:100%; on the aside element as it relies on parent elements that do not have a set height.

html,
body
{
 height:100%;
}

Check out the Jsfiddle link for more details.

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