html {
  height:100%;
}

body {
  margin:0;
}

.bg {
  animation:slide 7s ease-in-out infinite alternate;
  background-image: linear-gradient(-60deg, #39bbee 50%, #09f 50%);
  bottom:0;
  left:-50%;
  opacity:.5;
  position:fixed;
  right:-50%;
  top:0;
  z-index:-1;
}

.bg2 {
  animation-direction:alternate-reverse;
  animation-duration:5s;
}

.bg3 {
  animation-duration:10s;
}

.content {
  left:50%;
  padding:10vmin;
  position:fixed;
  text-align:center;
  top:50%;
  transform:translate(-50%, -50%);
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: #f8fafc;
  background: linear-gradient(180deg, rgba(17,24,39,0.35), rgba(17,24,39,0.2));
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  backdrop-filter: blur(10px);
}
.content img {
  width: 200px;
  filter: drop-shadow(0 8px 18px rgba(0,0,0,0.4));
}

h1 {
  font-family:monospace;
}

h3 {
  margin: 14px 0 12px 0;
  font-weight: 700;
  letter-spacing: .3px;
}

@keyframes slide {
  0% {
    transform:translateX(-25%);
  }
  100% {
    transform:translateX(25%);
  }
}