body, html {
    height: 100%;
    width: 100%;
}

body {
    background-color: black;
}

#back-btn {
    padding: 8px 25px;
    color: white;
    background-color: black;
    border: 1px solid white;
    position: absolute;
    top: 10%;
    left: 50%;
    transform: translateX(-50%);
    text-decoration: none;
    border-radius: 50px;
}

#h1-back {
    font-size: 28px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 800;
    color: white;
}