body::before {
    content: "EXERCISE";
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(-30deg);

    font-size: 20vw;              /* Big text, scales with screen */
    font-weight: bold;
    color: rgba(255, 0, 0, 0.08); /* Light red, non-intrusive */

    pointer-events: none;         /* Click-through */
    z-index: 9999;                /* Overlay above page content */
    white-space: nowrap;
}