html, body {
  position: fixed;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #000000;
}

iframe {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  display: block;
  background: #000000;
}
#tcst_logo {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 75%;
  height: auto;
  width: 275px;
  opacity: 0;
  animation: logoFade 3s ease-in-out forwards;
}
@keyframes logoFade {
  0% {
    opacity: 0;
  }
  30%,
  70% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}