:root {
  --pageBlack: #262626;
  --pageYellow: #fff200;
  --pagePurple: #552b55;
  --pageRed: #E1332d;

  

}
body {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  font-family: sans-serif;
}

.btn {
  border: 2px solid tomato;
  background: none;
  color: tomato;
  padding: 20px 40px;
  font-size: 25px;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 0.5s;
  position: relative;
  color: tomato;
  overflow: hidden;
  
}

.btn:hover {
  color: white;
}
.btn:before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: tomato;
  z-index: -1;
  border-radius: 50% 50% 0 0 ;
  transition: all 0.5s;
}
.btn:hover:before {
  height: 190%;

}