animated button in plain css

gistfile1.txt

<div>
  <a href="#" class="button"><span>Do Not Press This Button</span></a>
</div>

.button {
  display: inline-block;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: 0 10px 0 #823a17,  0 15px 20px rgba(0, 0, 0, .5);
  -moz-box-shadow: 0 10px 0 #823a17,  0 15px 20px rgba(0, 0, 0, .5);
  box-shadow: 0 10px 0 #823a17,  0 15px 20px rgba(0, 0, 0, .5);
  -webkit-transition: all .2s ease-in-out;
  -moz-transition: all .2s ease-in-out; 
  transition: all .2s ease-in-out;
}

.button span {
  display: inline-block;
  padding: 10px 20px;
  font-family: 'LeagueGothicRegular', sans-serif;
  font-size: 18px;
  text-transform: uppercase;
  line-height: 1;
  text-shadow: 0 -1px 1px rgba(19, 65, 88, .8);
  background: #bb5422;
  background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#FA8246), to(#bb5422));
  background: -moz-linear-gradient(top, #FA8246, #BB5422);
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: inset 0 -1px 1px rgba(255, 255, 255, .10);
  -moz-box-shadow: inset 0 -1px 1px rgba(255, 255, 255, .10);
  box-shadow: inset 0 -1px 1px rgba(255, 255, 255, .10);
  -webkit-transition: all .2s ease-in-out;
  -moz-transition: all .2s ease-in-out;
  transition: all .2s ease-in-out;
}

.button:active {
  -webkit-transition: -webkit-transform 0s ease-in-out;
  -moz-transition: -moz-transform 0s ease-in-out;
  transition: transform 0s ease-in-out;
  -webkit-box-shadow: 0 8px 0 #823a17,  0 12px 10px rgba(0, 0, 0, .3);
  -moz-box-shadow: 0 8px 0 #823a17,  0 12px 10px rgba(0, 0, 0, .3);
  box-shadow: 0 8px 0 #823a17,  0 12px 10px rgba(0, 0, 0, .3);
}

.button:active span {
  -webkit-transition: -webkit-transform 0s ease-in-out;
  -moz-transition: -moz-transform 0s ease-in-out;
  transition: transform 0s ease-in-out;
  -webkit-transform: translate(0, 4px);
  -moz-transform: translate(0, 4px);
  transform: translate(0, 4px);
}