.button {
  width: 200px;
  height: 40px;
  background: yellow;
  box-shadow: -6px 6px 0 0 hsl(60, 100%, 40%);
  border: none;
  outline: none;
  position: relative;
  font-size: 1.2rem;
  text-transform: uppercase;
  font-weight: bold;
}

.button:active {
  box-shadow: -3px 3px 0 0 hsl(60, 100%, 40%);
  top: 3px;
  left: -3px;
  background-color: hsl(60, 100%, 45%);
}

.button::before {
  content: '';
  position: absolute;
  background: none;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-right: 6px solid hsl(60, 100%, 40%);
  border-left-width: 0;
  top: 0;
  left: -6px;
}

.button:active::before {
  border: 3px solid transparent;
  border-right: 3px solid hsl(60, 100%, 40%);
}

.button::after {
  content: '';
  position: absolute;
  background: none;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-top: 6px solid hsl(60, 100%, 40%);
  border-bottom-width: 0;
  bottom: -6px;
  right: 0;
}

.button:active:after {
  border: 3px solid transparent;
  border-top: 3px solid hsl(60, 100%, 40%);
}