body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    font-family: Arial, Helvetica, sans-serif;
}

h1.glow {
    font-size: 8rem;
    color: #00ffff;
    text-shadow:
        0 0 5px #00ffff,
        0 0 10px #00ffff,
        0 0 20px #00ffff,
        0 0 40px #00ffff,
        0 0 80px #00ffff;
    animation: pulse 2s infinite;
    text-align: center;
}

@keyframes pulse {
    0%   { text-shadow: 0 0 5px #00ffff, 0 0 10px #00ffff, 0 0 20px #00ffff, 0 0 40px #00ffff, 0 0 80px #00ffff; }
    50%  { text-shadow: 0 0 10px #00ffff, 0 0 20px #00ffff, 0 0 30px #00ffff, 0 0 50px #00ffff, 0 0 100px #00ffff; }
    100% { text-shadow: 0 0 5px #00ffff, 0 0 10px #00ffff, 0 0 20px #00ffff, 0 0 40px #00ffff, 0 0 80px #00ffff; }
}