Set box-sizing property to border-box:
div {
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
width: 100px;
height: 100px;
border: 20px solid #f00;
background: #00f;
margin: 10px;
}
div + div {
border: 10px solid red;
}
Hello!
Hello!
It works on IE8 & above.
You can also use box-shadow like this:
div{
-webkit-box-shadow:inset 0px 0px 0px 10px #f00;
-moz-box-shadow:inset 0px 0px 0px 10px #f00;
box-shadow:inset 0px 0px 0px 10px #f00;
}
Example here: http://jsfiddle.net/nVyXS/ (hover to view border)
This works in modern browsers only. For example: No IE 8 support.
See caniuse.com (box-shadow feature) for more info.