Hover Effect: Animated Expansion of Border Bottom

In this question, the goal is to create a hover effect that extends the bottom border of an element upon hovering. To achieve this effect, we can utilize the transform property and transition it from 0 to 1 on hover.

h1 {
  color: #666;
  display: inline-block;
  margin: 0;
  text-transform: uppercase;
}

h1:after {
  display: block;
  content: '';
  border-bottom: solid 3px #019fb6;
  transform: scaleX(0);
  transition: transform 250ms ease-in-out;
}

h1:hover:after {
  transform: scaleX(1);
}

This approach uses a pseudo-element to separate the border transition from the text, preserving the original HTML structure. The transform-origin property can be manipulated to expand the border from different directions, as illustrated below:

h1.fromRight:after {
  transform-origin: 100% 50%;
}

h1.fromLeft:after {
  transform-origin: 0% 50%;
}