h1
{
    text-align: center;
    text-decoration: underline;
    color: rgb(234, 0, 255);
    margin-bottom: 3%;
}

body
{
    background-image: url(https://images.wallpapersden.com/image/download/batman-with-vignette_bWdqaGWUmZqaraWkpJRnamtlrWZpaWU.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}

h2
{
    text-align: center;
    color: rgb(255, 251, 0);
    font-size: 165%;
    text-decoration: underline;
}


h3
{
    text-align: center;
    color: rgb(0, 204, 255);
    font-size: 170%;
}

.btn
{
    height: 100px;
    width: 100px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    right: 20px;
    bottom: 20px;
}

.icone
{
    width: 50px;
    cursor: pointer;
}