Box-sizing reset css Code Snippet in 2025

Resets the box-model so that width and height are not affected by border or padding.

• Use box-sizing: border-box to include the width and height of padding and border when calculating the element's width and height.
• Use box-sizing: inherit to pass down the box-sizing property from parent to child elements.

<div class="box">border-box</div>
<div class="box content-box">content-box</div>

div {
  box-sizing: border-box;
}

*,
*:before,
*:after {
  box-sizing: inherit;
}

.box {
  display: inline-block;
  width: 120px;
  height: 120px;
  padding: 8px;
  margin: 8px;
  background: #F24333;
  color: white;
  border: 1px solid #BA1B1D;
  border-radius: 4px;
}

.content-box {
  box-sizing: content-box;
}