JSFiddle - React, Tailwind, and code Playground

by Trina Lu

HTML

<button class="box">
  <div>button hover effect</div>
</button>

SCSS

.box {
  background: #FFF;
  transition: 1s all;
  border: 0;
  padding: 0;
  position: relative;
}
.box div {
  padding: 10px;
  position: relative;
}

.box:before,
.box:after,
.box div:before,
.box div:after {
  position: absolute;
  content: "";
  background: red;
  transition: 0.5s all;
}
.box:before {
  width: 0%;
  height: 1px;
  top: 0;
  left: 0;
}
.box:after {
  top: 0;
  height: 0%;
  width: 1px;
  left: 0;
}
.box div:before {
  width: 0%;
  height: 1px;
  bottom: 0;
  right: 0;
}
.box div:after {
  bottom: 0;
  height: 0%;
  width: 1px;
  right: 0;
}

.box:hover {
  &:after,
  & div:after {
    height: 100%;
  }
  
  &:before,
  & div:before {
    width: 100%;
  }
  
}