The CSS and Sass code for my blog on making a 3D CSS button.

big-buttom.scss

// These are some nice reusable mixins I keep around

@mixin transition($type, $time, $ease) {
  -webkit-transition: $type $time $ease;
  transition: $type $time $ease;
}

@mixin border-radius($length) {
  border-radius: $length;
  -webkit-border-radius: $length;
  -moz-border-radius: $length;
}

.big-button {
  color: #000300;
  background-color: #00910A;
  padding: 10px;
  position: relative;
  text-align: center;
  font-size: 24px;
  font-weight: bold;
  
  @include transition(background-color, 0.2s, linear);
  @include border-radius(10px);
  
  box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;
    
  -webkit-box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;
  
  -moz-box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;
  
  &:hover { background-color: #00B00C; }
  &:active {
    box-shadow: 1px 1px 5px 0 #000000;
    -webkit-box-shadow: 1px 1px 5px 0 #000000;    
    -moz-box-shadow: 1px 1px 5px 0 #000000;
    top: 4px;
    left: 4px;
  }
}

big-button.css

.big-button {
  color: #000300;
  background-color: #00910A;
  padding: 10px;
  position: relative;
  text-align: center;
  font-size: 24px;
  font-weight: bold;

  box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;

  -webkit-box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;

  -moz-box-shadow:
    1px 1px 0 0 #014D06,
    2px 2px 0 0 #014D06,
    3px 3px 0 0 #014D06,
    4px 4px 0 0 #014D06,
    5px 5px 5px 0 #000000;

  border-radius: 10px;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;

  -webkit-transition: background-color 0.2s linear;
  transition: background-color 0.2s linear;
}

.big-button:active {
  box-shadow: 1px 1px 5px 0 #000000;
  -webkit-box-shadow: 1px 1px 5px 0 #000000;    
  -moz-box-shadow: 1px 1px 5px 0 #000000;
  top: 4px;
  left: 4px;
}

.big-button:hover { background-color: #00B00C; }