.button-container {
  display: flex;
  justify-content: center;
  margin: 20px;
}

.button-3d {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  border-width: 0;
  padding: 0 8px;
  min-width: 4em;
  min-height: 4em;
  box-sizing: border-box;
  background: transparent;
  font: inherit;
  cursor: pointer;
  margin: 10px;
  border-radius: 20px;
}

.button-top {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  padding: 8px 16px;
  transform: translateY(0);
  color: #fff;
  background-image: linear-gradient(145deg, #6a11cb, #2575fc);
  text-shadow: 0 -1px rgba(0, 0, 0, 0.25);
  border-radius: 20px;
  transition: transform 0.3s, border-radius 0.3s, background 10s;
}

.button-3d:active .button-top {
  border-radius: 10px 10px 8px 8px / 8px;
  transform: translateY(2px);
  background-image: linear-gradient(145deg, #2575fc, #6a11cb);
}

.button-bottom {
  position: absolute;
  z-index: 1;
  bottom: 4px;
  left: 4px;
  border-radius: 20px;
  padding-top: 6px;
  width: calc(100% - 8px);
  height: calc(100% - 10px);
  background-image: linear-gradient(145deg, #2575fc, #6a11cb);
  box-shadow: 0px 2px 3px 0px rgba(0, 0, 0, 0.5);
  transition: border-radius 0.2s, padding-top 0.2s;
}

.button-base {
  position: absolute;
  z-index: 0;
  top: 4px;
  left: 0;
  border-radius: 20px;
  width: 100%;
  height: calc(100% - 4px);
  background-color: rgba(0, 0, 0, 0.15);
  box-shadow: 0 1px 1px 0 rgba(255, 255, 255, 0.75),
    inset 0 2px 2px rgba(0, 0, 0, 0.25);
  transition: border-radius 0.2s, padding-top 0.2s;
}

.button-3d:active .button-bottom {
  border-radius: 10px 10px 8px 8px / 8px;
  padding-top: 0;
}

.button-3d:active .button-base {
  border-radius: 10px 10px 8px 8px / 8px;
}