Determine the Sidebar Height within a CSS Container

I've been experimenting with a simple template to create a basic website layout featuring a header, footer, and a right-hand sidebar.

However, I'm facing difficulties in setting the right-hand bar to occupy 100% of the page, even after ensuring that all parent elements and the right bar itself are set to 100%:

https://i.sstatic.net/ndY2Y.png

If anyone could provide guidance on where I might be making a mistake, it would be greatly appreciated!

* {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
  display: block;
}
body {
  font: 16px/26px Helvetica, Helvetica Neue, Arial;
  height: 100%;
}
.wrapper {
  width: 100%;
  min-height: 100%;
}

/* Header */
.header {
  height: 50px;
  background: #FFE680;
}

/* Middle */
.middle {
  width: 100%;
  padding: 0 0 50px;
  position: relative;
  height: 100%;
}
.middle:after {
  display: table;
  clear: both;
}
.container {
  width: 100%;
  float: left;
  overflow: hidden;
  height: 100%;
}
.content {
  height: 100%;
}

/* Right Sidebar */
.right-sidebar {
  float: right;
  width: 250px;
  margin-left: -250px;
  position: relative;
  background: #FFACAA;
  height: 100%;
}

/* Footer */
.footer {
  margin: -50px auto 0;
  height: 50px;
  background: #BFF08E;
  position: relative;
}
<div class="wrapper">
  <header class="header">
    <strong>Header:</strong>Header
  </header>
  <div class="middle">
    <div class="container">
      <main class="content">
        <strong>Content:</strong>Content
      </main>
    </div>
    <aside class="right-sidebar">
      <strong>Right Sidebar:</strong>Right sidebar
    </aside>
  </div>
</div>
<footer class="footer">
  <strong>Footer:</strong>Footer
</footer>

htmlcsslayout

Answer №1

One reason is that the <div class="middle"> element does not expand on its own. To adjust the height, you can utilize viewport units to occupy the full height of the viewport and then subtract the height of the header and footer.

.middle {
  ...
  height: calc(100vh - 100px);
}


* {
  margin: 0;
  padding: 0;
}
html {
  height: 100%;
}
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
  display: block;
}
body {
  font: 16px/26px Helvetica, Helvetica Neue, Arial;
  height: 100%;
}
.wrapper {
  width: 100%;
  min-height: 100%;
}

/* Header */
.header {
  height: 50px;
  background: #FFE680;
}

/* Middle */
.middle {
  width: 100%;
  padding: 0 0 50px;
  position: relative;
  height: calc(100vh - 100px);
}
.middle:after {
  display: table;
  clear: both;
}
.container {
  width: 100%;
  float: left;
  overflow: hidden;
  height: 100%;
}
.content {
  height: 100%;
}

/* Right Sidebar */
.right-sidebar {
  float: right;
  width: 250px;
  margin-left: -250px;
  position: relative;
  background: #FFACAA;
  height: 100%;
}

/* Footer */
.footer {
  margin: -50px auto 0;
  height: 50px;
  background: #BFF08E;
  position: relative;
}
<div class="wrapper">
  <header class="header">
    <strong>Header:</strong>Header
  </header>
  <div class="middle">
    <div class="container">
      <main class="content">
        <strong>Content:</strong>Content
      </main>
    </div>
    <aside class="right-sidebar">
      <strong>Right Sidebar:</strong>Right sidebar
    </aside>
  </div>
</div>
<footer class="footer">
  <strong>Footer:</strong>Footer
</footer>

Answer №2

To implement CSS Positioning, simply insert the following code:

Within the .container, include

position: relative;

For the .sidebar-right, use

position: absolute;
top: 0;
right: 0;
bottom: 0;

Furthermore, in the .sidebar-right attributes, delete

float: right;
margin-left: -250px;
position: relative;
height: 100%;

Trust this has provided the assistance you needed.

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