body,
html,
#app {
  margin: 0;
  width: 100%;
  height: 100%;
  // background-image: url("https://images.pexels.com/photos/2961995/pexels-photo-2961995.jpeg?auto=compress&cs=tinysrgb&h=800&dpr=1");
}

#app {
  overflow: hidden;
  touch-action: pan-up;
  color: #ffffff;
  font-family: "Montserrat", sans-serif;
  text-align: center;
  text-shadow: 0 0 5px #000000, 0 0 20px #000;
  user-select: none;
}

#app h1 {
  --fontSize: 50px;
  --lineHeight: 70px;
  width: auto;
  height: calc(2 * var(--lineHeight));
  line-height: var(--lineHeight);
  margin: calc(50vh - var(--lineHeight)) auto 0;
  font-size: var(--fontSize);
}

#app a {
  margin-top: 10px;
  display: inline-block;
  text-decoration: none;
  color: #fff;
}

#app canvas {
  display: block;
  position: fixed;
  z-index: -1;
  top: 0;
}

@keyframes flap {
  0%,
  20%,
  80%,
  100% {
    transform: scaleX(1) rotate(5deg);
  }
  50% {
    transform: scaleX(0.7) rotate(7deg);
  }
}

h1 {
  text-align: center;
  font-size: 2rem;
}

h1 span {
  display: inline-block;
  animation: flap 0.75s infinite ease-in-out;
}

#controls {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  display: flex;
  align-items: center;
}
.btn {
  background-color: rgba(0, 0, 0, 0.4);
  border: none;
  color: rgba(255, 255, 255, 0.4);
  padding: 10px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 2px 2px;
  cursor: pointer;
  border-radius: 5px;
  transition: background-color 0.3s;
}
.btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
  color: rgba(255, 255, 0, 1);
}
#fullscreenBtn {
  font-size: 20px;
  z-index: 100;
}