html,
body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #eaf6fb;
}

header,
footer {
    display: none !important;
}

main {
    margin: 0 !important;
    padding: 0 !important;
    width: 100%;
    height: 100vh;
}

.challenge-container {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #eaf6fb;
}

    .challenge-container a {
        width: 100%;
        height: 100%;
    }

    .challenge-container img {
        width: 100vw;
        height: 100vh;
        object-fit: fill;
        display: block;
    }