* {
  box-sizing: border-box;
}

body {  
  background: rgba(0, 0, 0, 0);
  overflow: hidden;
}

#canvas {
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
}

.sprite {
  position: absolute;
  visibility: hidden;
  opacity: 0;
  width: 80px;
  height: 80px;
}

.controls {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  padding: 15px;
  z-index: 10;
}

button {
  display: none;
  background: #afca05;
  color: #fff;
  border: none;
  border-radius: 2px;
  position: relative;
  height: 36px;
  margin: 0;
  min-width: 64px;
  padding: 0 16px;
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0;
  overflow: hidden;
  outline: none;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  line-height: 36px;
  vertical-align: middle;
  box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.14), 0 3px 1px -2px rgba(0, 0, 0, 0.2), 0 1px 5px 0 rgba(0, 0, 0, 0.12);
}