<!-- this script is provided by www.htmlbestcodes.com coded by: Kerixa Inc. -->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css">
<link rel='stylesheet' href='https://fonts.googleapis.com/css?family=Source+Code+Pro:300'>
<style>
body {
  font-family: 'Source Code Pro', sans-serif;
}

.wrap {
  padding: 1% 2%;
}

.underlined {
  color: black;
  flex: 1;
  font-size: 1em;
  line-height: 1.2;
  text-decoration: none;
  background-image: linear-gradient(to right, yellow 0, yellow 100%);
  background-position: 0 1.2em;
  background-size: 0 100%;
  background-repeat: no-repeat;
  transition: background .5s;
}
.underlined:hover {
  background-size: 100% 100%;
}
.underlined--thin {
  background-image: linear-gradient(to right, black 0, black 100%);
}
.underlined--thick {
  background-position: 0 -0.1em;
}
.underlined--offset {
  background-position: 0 0.2em;
  box-shadow: inset 0 -.5em 0 0 white;
}
.underlined--gradient {
  background-position: 0 -0.1em;
  background-image: linear-gradient(to right, yellow 0, lightgreen 100%);
}
.underlined--reverse {
  background-position: 100% -0.1em;
  transition: background 1s;
  background-image: linear-gradient(to right, yellow 0, yellow 100%);
}
p{
margin-top: 1em;
}
</style>

<div class="wrap">
<p><a href="#" class="underlined underlined--thin">I'm a very long text with an underline effect</a></p>
<p><a href="#" class="underlined underlined--thick">I'm another very long highlighted link.</a></p>
<p><a href="#" class="underlined underlined--offset">I'm another very long link and I'm an artist you know.</a></p>
<p><a href="#" class="underlined underlined--gradient">I am Rainbow</a></p>
<p><a href="#" class="underlined underlined--reverse">I'm another long link and I don't like lorem.</a></p>
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