style.css

body {
  margin: 0;
  padding: 0;
  overflow: hidden;
}
canvas {
  margin: 0;
  padding: 0;
}
.main {
  position: relative;
}
.controls {
  position: absolute;
  top: 50vh;
  left: 70vw;
  width: 6rem;
  height: 4rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
  z-index: 900;
  /* background-color: #ddd;  */
}

.controls button.key {
  background-color: #eee;
  width: 2rem;
  font-size: 1.5rem;
  font-weight: 600;
}

.one {
  width: 100%;
  display: flex;
  justify-content: center;
}
.three {
  width: 100%;
  display: flex;
  justify-content: space-between;
}
#warning-message {
  width: 100%;
  height: 100vh;
  background-color: aquamarine;
  font-size: 2rem;
  display: none;
  /* margin: 10rem; */
}
.text {
  padding-top: 2rem;
  text-align: center;
}
@media only screen and (orientation: portrait) {
  .main {
    display: none;
  }
  #warning-message {
    display: block;
  }
}
@media only screen and (orientation: landscape) {
  #warning-message {
    display: none;
  }
}