body, html {
    height: 100%;
    margin: 0;
    background-color: #000;
    color: #fff;
    font-family: 'Press Start 2P', monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
}

h1 {
    font-size: 3rem;
    text-shadow: 4px 4px 0px #555;
    animation: flicker 1.5s infinite alternate;
}

@keyframes flicker {
    0%, 18%, 22%, 25%, 53%, 57%, 100% {
        text-shadow:
            0 0 4px #fff,
            0 0 11px #fff,
            0 0 19px #fff,
            0 0 40px #0fa,
            0 0 80px #0fa,
            0 0 90px #0fa,
            0 0 100px #0fa,
            0 0 150px #0fa;
    }
    20%, 24%, 55% {
        text-shadow: none;
    }
}