Metzploreur/public/css/hotLine.css

body {
    position: absolute;
}

#first_div {
    margin: 10rem 3rem 12rem 3rem;
    padding: 2rem 2rem 15rem 2rem;
    background-color: white;
    opacity: 80%;
    border: 0.2rem solid rgba(230,173,26,255);
    border-radius: 10px;
    align-items: center;
    position: relative;
    z-index: 1;
}

#first_div h1 {
    text-align: center;

}

#hiddenDiv {
    display: none;
    object-fit: cover;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: 10rem 3rem 12rem 3rem;
    padding: 2rem 2rem 15rem 2rem;
    background-color: white;
    border: 0.2rem solid rgba(230,173,26,255);
    border-radius: 10px;
    align-items: center;
    position: fixed;
    z-index: 10;
}

#hiddenDiv h1 {
    text-align: center;
}