border box in css code example

Example 1: css border botttom

div {
  border-bottom: 4px dashed blue;
  background-color: gold;
  height: 100px;
  width: 100px;
  font-weight: bold;
  text-align: center;
}

Example 2: border-box css

#example1 {
  box-sizing: border-box;
}

Example 3: box sizing border box

*{
 box-sizing: border-box;
 }