body{
    background-image: url(https://www.pixelstalk.net/wp-content/uploads/2016/11/Amazing-aquarium-wallpaper-ultra-hd.jpg)
}
div{
    border: 2px solid black;
    background-color: aliceblue;
    width: 500px;
    height: 200px;
    margin: 0 auto;
}
h1, p, h3{
    text-align: center;
    color: rgb(49, 134, 245);
}
h1{
    text-decoration: underline;
}
#attention{
    color: red;
}