My CTA button style.

button.css

.btn {
  border: 2px solid #dd4814;
  background-color: orange;
  color: white;
  text-transform: uppercase;
  padding: 4px 15px;
  font: 900 1.4em Fira Sans, Fira Sans OT, Helvetica, sans-serif;
  letter-spacing: .05em;
  border-radius:2px;
  cursor: pointer;
  width: 100%;

  background-image: -webkit-gradient(
    linear,
    left top,
    left bottom,
    color-stop(0, #FF8000),
    color-stop(0.66, #FA6603)
  );
  background-image: -o-linear-gradient(bottom, #FF8000 0%, #FA6603 66%);
  background-image: -moz-linear-gradient(bottom, #FF8000 0%, #FA6603 66%);
  background-image: -webkit-linear-gradient(bottom, #FF8000 0%, #FA6603 66%);
  background-image: -ms-linear-gradient(bottom, #FF8000 0%, #FA6603 66%);
  background-image: linear-gradient(to bottom, #FF8000 0%, #FA6603 66%);
}

 .btn:hover, .btn:active {
  background-image:none;
  text-decoration: none;
  background-color: #dd4814;
  box-shadow: inset 0 0 7px black;
}