h1 {background-color:#ff8700;}
.btn {
  -webkit-border-radius: 28;
  -moz-border-radius: 28;
  border-radius: 28px;
  text-shadow: 5px 5px 6px #666666;
  -webkit-box-shadow: 6px 6px 6px #666666;
  -moz-box-shadow: 6px 6px 6px #666666;
  box-shadow: 6px 6px 6px #666666;
  font-family: Arial;
  color: #ffffff;
  font-size: 20px;
  background: #ff8700;
  padding: 10px 20px 10px 20px;
  text-decoration: none;
}

.btn:hover {
  background: lime;
  # background-image: -webkit-linear-gradient(top, #3cb0fd, #3498db);
  # background-image: -moz-linear-gradient(top, #3cb0fd, #3498db);
  # background-image: -ms-linear-gradient(top, #3cb0fd, #3498db);
  # background-image: -o-linear-gradient(top, #3cb0fd, #3498db);
  # background-image: linear-gradient(to bottom, #3cb0fd, #3498db);
  text-decoration: none;
}
# ab hier codepen.io

output, container {
    display: flex;
    background-color: #f0db4f;
    justify-content: center;
    margin-top: 100px;
}


input {
    background-color: #eee;
    border: none;
    font-family: sans-serif;
    color: #000;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 30px;
}
#codepen.io ENDE