.bg {
  display: none;
}

.button {
  width: 130px;
  border-radius: 5px;
  text-align: center;
  line-height: 40px;
  height: 40px;
  margin: 100px auto;
  background-color: #3C3C3C;
  font-weight: bold;
  font-size: 12px;
  cursor: pointer;
  transition: all 200ms;
  color: #FFF;
}

.button:hover {
  background-color: #515151;
}

body, html {
  display: flex;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #191919;
  min-height: 100%;
  width: 100%;
}

body:before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: radial-gradient(ellipse at center, rgba(33,33,33,1) 0%, rgba(18,18,18,1) 100%);
  opacity: .6;
}

canvas#apparatus {
  z-index: 1;
  position: absolute;
  top: 0px;
  left: 0px;
}

* {
  position: relative;
  z-index: 2;
}