*, *:before, *:after {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
}

body {
  background: #222;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-family: 'Noto Sans', sans-serif;
}

a {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid #EE3769;
  border-radius: 8px;
  height: 2.8em;
  width: 10em;
  padding: 0;
  outline: none;
  overflow: hidden;
  color: #EE3769;
  -webkit-transition: color 0.3s 0.1s ease-out;
  transition: color 0.3s 0.1s ease-out;
  text-align: center;
  line-height: 250%;
}
a::before {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  content: '';
  border-radius: 50%;
  display: block;
  width: 20em;
  height: 20em;
  line-height: 20em;
  left: -5em;
  text-align: center;
  -webkit-transition: box-shadow 0.5s ease-out;
  transition: box-shadow 0.5s ease-out;
  z-index: -1;
}
a:hover {
  color: #fff;
}
a:hover::before {
  box-shadow: inset 0 0 0 10em #ee3769;
}