*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

#app {
  position: relative;
  width: 800px;
  height: 600px;
  flex-shrink: 0;
}

#webamp {
  transform: translateZ(0);
}