Answers for "underline transform css"

text underline hover css

a:hover {
  text-decoration: underline;
}

text decoration css transition

.un {
  display: inline-block;
}

.un::after {
  content: '';
  width: 0px;
  height: 1px;
  display: block;
  background: black;
  transition: 300ms;
}

.un:hover::after {
  width: 100%;
}