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CSS - box-sizing

box-sizing

box-sizing defines how the height and width of an element are calculated and if they should include borders and padding

this usually defines the box sizing and is included in a html reset like * { box-sizing:border-box; }

border-box makes calculating the sizes much easier in a layout so box-sizing is usually set to border-box.

Property Variable Name

box-sizing

Available Values for box-sizing

content-box|border-box|initial|inherit

Examples Using box-sizing values

Example using box-sizing content-box

Example using box-sizing content-box

Here is an example using different box-sizing values

Demo Box 1 Content 1

Code

<style>
.demo-box-1 {
  position:relative;
  border-radius:3px;
  margin-bottom:10px;
  border:1px solid #000;
  height:240px;
  width:100%;
  transition: all 0.3s;
}
.demo-box-1 .dbs-1 {
  font-size:14px;
  transition: all 0.3s;
  position:absolute;
  display:block;
  padding:10px;
  background:#3b7aa0;
  color:#FFF;
  margin:0 1%;
  height:120px;
  width:120px;
  box-shadow:0px 5px 10px #000;
  border:3px solid #EEE;
  border-radius:3px;
}
.demo-box-1 .dbs-1 {
  transition: all 0.3s;
  position:absolute;
  box-sizing:content-box;
}
</style>

<h2>Example using box-sizing content-box</h2>
<p>Here is an example using different box-sizing values</p>
<div class='demo-box-1'>
  <div class='dbs-1'>Demo Box 1 Content 1</div>
</div>
Example using box-sizing border-box

Example using box-sizing border-box

Here is an example using different box-sizing values

Demo Box 2 Content 1

Code

<style>
.demo-box-2 {
  position:relative;
  border-radius:3px;
  margin-bottom:10px;
  border:1px solid #000;
  height:240px;
  width:100%;
  transition: all 0.3s;
}
.demo-box-2 .dbs-2 {
  font-size:14px;
  transition: all 0.3s;
  position:absolute;
  display:block;
  padding:10px;
  background:#3b7aa0;
  color:#FFF;
  margin:0 1%;
  height:120px;
  width:120px;
  box-shadow:0px 5px 10px #000;
  border:3px solid #EEE;
  border-radius:3px;
}
.demo-box-2 .dbs-2 {
  transition: all 0.3s;
  position:absolute;
  box-sizing:border-box;
}
</style>

<h2>Example using box-sizing border-box</h2>
<p>Here is an example using different box-sizing values</p>
<div class='demo-box-2'>
  <div class='dbs-2'>Demo Box 2 Content 1</div>
</div>
Example using box-sizing initial

Example using box-sizing initial

Here is an example using different box-sizing values

Demo Box 3 Content 1

Code

<style>
.demo-box-3 {
  position:relative;
  border-radius:3px;
  margin-bottom:10px;
  border:1px solid #000;
  height:240px;
  width:100%;
  transition: all 0.3s;
}
.demo-box-3 .dbs-3 {
  font-size:14px;
  transition: all 0.3s;
  position:absolute;
  display:block;
  padding:10px;
  background:#3b7aa0;
  color:#FFF;
  margin:0 1%;
  height:120px;
  width:120px;
  box-shadow:0px 5px 10px #000;
  border:3px solid #EEE;
  border-radius:3px;
}
.demo-box-3 .dbs-3 {
  transition: all 0.3s;
  position:absolute;
  box-sizing:initial;
}
</style>

<h2>Example using box-sizing initial</h2>
<p>Here is an example using different box-sizing values</p>
<div class='demo-box-3'>
  <div class='dbs-3'>Demo Box 3 Content 1</div>
</div>
Example using box-sizing inherit

Example using box-sizing inherit

Here is an example using different box-sizing values

Demo Box 4 Content 1

Code

<style>
.demo-box-4 {
  position:relative;
  border-radius:3px;
  margin-bottom:10px;
  border:1px solid #000;
  height:240px;
  width:100%;
  transition: all 0.3s;
}
.demo-box-4 .dbs-4 {
  font-size:14px;
  transition: all 0.3s;
  position:absolute;
  display:block;
  padding:10px;
  background:#3b7aa0;
  color:#FFF;
  margin:0 1%;
  height:120px;
  width:120px;
  box-shadow:0px 5px 10px #000;
  border:3px solid #EEE;
  border-radius:3px;
}
.demo-box-4 .dbs-4 {
  transition: all 0.3s;
  position:absolute;
  box-sizing:inherit;
}
</style>

<h2>Example using box-sizing inherit</h2>
<p>Here is an example using different box-sizing values</p>
<div class='demo-box-4'>
  <div class='dbs-4'>Demo Box 4 Content 1</div>
</div>
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