.cover {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
}
.cover .hi {
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 1.3em;
  line-height: 1.1;
  text-align: center;
}
.cover .hi span {
  color: #ff0;
  cursor: pointer;
  text-decoration: underline;
}

.cover .hi em.hidden {
  display: none;
}
.tv {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
.tv .screen {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1;
  margin: auto;
  opacity: 0;
  transition: opacity .5s;
}
.tv .screen.active {
  opacity: 1;
}