JSFiddle - React, Tailwind, and code Playground

by Ayri Rin

HTML

<a href="">text</a>

<button class="btn btn_material">Button</button>

SCSS

html {
  background-color: #444;
  font: normal 16px sans-serif;
  
  * {
    margin: 0;
    padding: 0;
    height: 100px;
  }
}
body {
  display: flex;
  flex-direction: column;
}
a {
  position: relative;
  z-index: 1;
  display: flex;
  width: 250px;
  height: 50px;
  align-items: center;
  justify-content: center;
  margin: 10px auto;
  background-color: greenyellow;
  border-radius: 5px;
  line-height: 50px;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  color: black;
  overflow: hidden;
  
  &::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
    display: block;
    width: 10px;
    height: 10px;
    margin: 20px auto 0;
    background-color: white;
    border-radius: 10px;
    opacity: 0;
  }
  
  &:hover {
    &::before {
      transform: scale(30);
      transition: .5s;
      animation: mymove .5s;
    }
  }
}

@keyframes mymove {
  0%   {opacity: .1;}
  50%  {opacity: .5;}
  100% {opacity: 0;}
}

.btn {
  margin: 10px auto;
  background: transparent;
  border: 2px solid purple;
  color: purple;
  display: inline-block;
  margin: 0;
  padding: 8px 16px;
}

.btn_material {
  overflow: hidden;
  position: relative;
}

.btn_material:after {
  background: purple;
  border-radius: 50%;
  content: "";
  height: 1px;
  left: 50%;
  position: absolute;
  top: 50%;
  width: 1px;
  transform: translateX(-50%) translateY(-50%);
}

.btn_material:active {
  &:after {
    height: 50px;
    width: 50px;
    animation: ripple 1s;
  }
}


@keyframes ripple {
    from {
      transform: scale(1);
      opacity: 0.4;
    }
    to {
      transform: scale(100);
      opacity: 0;
    }
}