.button.gray {
  background-color: #ffc107;
}

.button {
  position: relative;
  display: inline-block;
  padding: 0.618rem 1.618rem;
  cursor: pointer;
  color: #FFF;
  letter-spacing: 1px;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.9);
  background: #434343 none repeat scroll 0% 0%;
  border: 1px solid #242424;
  border-radius: 4px;
  box-shadow:
          0 1px 0 rgba(255, 255, 255, 0.25),
          0 1px 0 rgba(255, 255, 255, 0.25) inset,
          0 0 0 rgba(0, 0, 0, 0.5) inset,
          0 1.25rem 0 rgba(255, 255, 255, 0.08) inset,
          0 -1.25rem 1.25rem rgba(0, 0, 0, 0.3) inset,
          0 1.25rem 1.25rem rgba(255, 255, 255, 0.1) inset;

  transition: all 0.2s linear 0s;

  text-align: center;
  text-decoration: none;
  margin: 0.618rem;
}


.button:hover,
.button:focus {
  text-decoration: none;
  box-shadow:
          0 2px 5px rgba(0, 0, 0, 0.5),
          0 1px 0 rgba(255, 255, 255, 0.25) inset,
          0 0 0 rgba(0, 0, 0, 0.25) inset,
          0 20px 0 rgba(255, 255, 255, 0.03) inset,
          0 -20px 20px rgba(0, 0, 0, 0.15) inset,
          0 20px 20px rgba(255, 255, 255, 0.05) inset;
}
.button:active {
  box-shadow:
          0 1px 0 rgba(255, 255, 255, 0.25),
          0 1px 0 rgba(255, 255, 255, 0) inset,
          0 0 5px rgba(0, 0, 0, 0.5) inset,
          0 20px 0 rgba(255, 255, 255, 0.03) inset,
          0 -20px 20px rgba(0, 0, 0, 0.15) inset,
          0 20px 20px rgba(255, 255, 255, 0.05) inset;
}


.button::before {
  content: "";
  display: block;
  position: absolute;
  background:-moz-linear-gradient(left, rgba(255,255,255,0) 0%, rgba(255,255,255,1) 50%, rgba(255,255,255,0) 100%);
  background:-webkit-gradient(linear, left top, right top, color-stop(0%,rgba(255,255,255,0)), color-stop(50%,rgba(255,255,255,1)), color-stop(100%,rgba(255,255,255,0)));
  background:-webkit-linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);
  background:linear-gradient(left, rgba(255,255,255,0) 0%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 100%);
  padding: x 12px;
  top: 0;
  left: 15%;
  height: 1px;
  width: 40%;
  box-shadow: 0 1px 5px rgba(255, 255, 255, 0.2);
  transition: all 0.3s ease-in-out 0s;
}
.button:active::before {
  opacity: 0;
}
.button:hover::before {
  left: 45%;
}