body {
    background: linear-gradient(
        45deg,
        #ff6b6b,
        #4ecdc4,
        #45b7d1,
        #a86bd1,
        #ff9f68,
        #ff6b6b
    );
    background-size: 400% 400%;
    animation: gradient 15s ease infinite;
    min-height: 100vh;
    margin: 0;
}

@keyframes gradient {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

h1 {
  margin-top: 2em;
  text-align: center;
}

video {
    display: block;
    margin: 2em auto;
}