Edit line thickness of CSS 'underline' attribute

Question

Since you can underline any text in CSS like so:

h4 {
    text-decoration: underline;
}

How can you also then edit the \'line\' that is drawn

Answer 1

Another way to do this is using ":after" (pseudo-element) on the element you want to underline.

h2{
  position:relative;
  display:inline-block;
  font-weight:700;
  font-family:arial,sans-serif;
  text-transform:uppercase;
  font-size:3em;
}
h2:after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  right:0;
  margin:auto;
  background:#000;
  height:1px;

}