* {
  box-sizing: border-box;
}
body,
html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
canvas {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
}
#interface {
  position: fixed;
  bottom: 0;
  width: 100%;
  justify-content: center;
  align-items: end;
  padding: 1em;
  white-space: nowrap;
  overflow: auto;
}
#interface button {
  border: none;
  backgroud: white;
  width: 3em;
  height: 3em;
  border-radius: .3em;
  margin: 0.5em;
  outiline: 0;
  box-shadow: 0 5px 5px 2px rgba(0, 0, 0, 0.4);
  transition: all .5s;
  flex-shrink: 0;
}
#interface button:hover {
  border: .2em solid white;
  transform: translateY(-1em);
  transition: all .2s;
}
#interface button.selected {
  border: .2em solid white;
  transform: translateY(-1em);
  transition: all .2s;
}
.top-right {
  position: fixed;
  top: 0;
  right: 0;
  padding: 1em;
  background: rgba(255, 255, 255, 0.5);
  font-family: sans-serif;
  font-weight: bold;
}