.demo-watermark {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-45deg);
    font-size: 8rem;
    color: rgba(0, 0, 0, 0.15);
    pointer-events: none;
    z-index: 9999;
    white-space: nowrap;
    font-weight: bold;
    font-family: sans-serif;
    user-select: none;
    text-transform: uppercase;
    width: 100%;
    text-align: center;
}

@media (max-width: 768px) {
    .demo-watermark {
        font-size: 4rem;
    }
}