body {
  background: #333;
  color: #fff;
}
a {
  display: block;
  text-decoration: none;
  text-transform: uppercase;
  font-family: sans-serif;
  font-weight: bold;
  background-color: #3465af;
  border-radius: 8px;
  color: #fff;
  width: 100%;
  max-width: 400px;
  height: 20px;
  padding: 10px;
  margin-bottom: 10px;
  text-align: center;
  transition: 0.5s all;
}
a:hover {
  opacity: 0.8;
}