body {
  font-family: Arial;
  background: #f4f6f8;
}
.container {
  width: 400px;
  margin: 40px auto;
  background: #fff;
  padding: 20px;
  border-radius: 10px;
}
a {
  display: block;
  margin: 10px 0;
  padding: 10px;
  background: #3ca55c;
  color: #fff;
  text-align: center;
  text-decoration: none;
}