body,
html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
    overflow-x: hidden;
}

.content {
    text-align: center;
}

.hidden {
    display: none;
}

.content-container {
    overflow: auto;
    position: relative;
}

.content-container::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: -1;
    display: block;
    background-size:cover;
    width: 100%;
    height: 100%;
}