styles.css

button {
  display: inline-block;
  background-color: #38d895;
  border-radius: 10px;
  border: 4px double #cccccc;
  color: #ffffff;
  text-align: center;
  font-size: 28px;
  padding: 20px;
  width: 200px;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px;
  text-align: center;
}

button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}
button span:after {
  content: "\00bb";
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
  transition: 0.5s;
}
button:hover {
  background-color: radial-gradient(red, rgb(0, 255, 123), rgb(0, 21, 128));
}
button:hover span {
  padding-right: 25px;
}
button:hover span:after {
  opacity: 1;
  right: 0;
}

body {
  background-color: rgb(255, 144, 80);
  text-align: center;
  font-family: "Merriweather", serif;
}