html, body {
    height: 100%;
    margin: 0;
}

body::before {
    content: "";
    position: fixed;
    bottom: 0;
    left: 0;

    height: 80vh;        /* 80% of viewport height */
    width: auto;

    aspect-ratio: 1 / 1; /* adjust if logo isn’t square */
    background-image: url("/design.svg");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: bottom left;

    opacity: 0.18;       /* faded */
    pointer-events: none;/* don't block clicks */
    z-index: 0;
}

.page-wrapper {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;                 /* takes remaining height */
    display: flex;
    justify-content: center; /* horizontal center */
    align-items: center;     /* vertical center */
}

footer {
    background: #333;
    color: white;
    padding: 1rem;
    text-align: center;
}