Standform d.school button

Rough imitation of buttons on https://dschool.stanford.edu

HTML

<a href="#">Lorem ipsum</a>

SCSS

a {
  border: 0 solid #FC0;
  border-width: 3px 0 0 3px;
  display: inline-block;
  padding: 1em 2em;
  position: relative;
  transition: background 0.4s ease-out 0.2s;
}

a::before,
a::after {
  transition: transform 0.2s ease-out;
  background-color: #fc0;
  content: '';
  display: block;
  position: absolute;
  transform-origin: 0 0;
}

a::before {
  bottom: 0;
  left: 0;
  height: 3px;
  width: 100%;
  transform: scaleX(0.5);
}

a::after {
  top: 0;
  right: 0;
  height: 100%;
  width: 3px;
  transform: scaleY(0.5);
}

a:hover {
  background: #fc0;
  
  &::before,
  &::after {
    transform: scale(1);
  }
}

body {
  background: #fff;
  margin: 1em;
}