body {
    margin: 0;
    padding: 0;
    background-color: #fec900;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.promotion-ended {
    position: relative;
    text-align: center;
}

.desktop-image {
    display: block;
    width: 100%;
    height: auto;
}

.mobile-image {
    display: none;
    width: 100%;
    height: auto;
}

@media (max-width: 768px) {
    .desktop-image {
        display: none;
    }

    .mobile-image {
        display: block;
    }
}