$color-bg: #181818;

body {
  background: $color-bg;
  color: #fff;
  font: 100%/1.5 'Michroma', sans-serif;
  padding: 2em;
  text-align: center;
}

h1 {
  font-size: 1.8em;
  margin-bottom: 1em;
}

button {
  background: #000;
  background: linear-gradient(#494949, #282828);
  border: none;
  box-shadow: inset 0 100px 100px -100px transparent;
  color: #ccc;
  cursor: pointer;
  display: inline-block;
  font-family: 'Michroma', sans-serif;
  font-size: 1em;
  line-height: 1;
  margin: 0 0.5em;
  padding: 1em 2em;
  position: relative;
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.75);
  transition-property: box-shadow, color, text-shadow;
  transition-duration: 300ms;
}

button:before,
button:after {
  border-color: transparent;
  border-style: solid;
  border-width: 5px;
  content: '';
  position: absolute;
}

button:before {
  border-left-color: $color-bg;
  border-top-color: $color-bg;
  left: 0;
  top: 0;
}

button:after {
  border-bottom-color: $color-bg;
  border-right-color: $color-bg;
  bottom: 0;
  right: 0;
}

button:hover {
  box-shadow: inset 0 100px 100px -100px rgba(255, 255, 255, 0.5);
  color: #fff;
}

button:focus {
  outline: none;
}

button:active {
  text-shadow: 0 0 30px #fff, 0 0 20px #fff, 0 0 10px #fff;
  top: 1px;
  transition-duration: 0;
}