body {
    background-image: url("question-mark-background-vector.jpg");
    background-attachment: fixed;
    font-family: arial;
    background-size: 100% 100%;
}

div.entire{
    background-color: blue;
    width: 50%;
}

form{
    background-color: red;
    width: 50%;
    height: 50%;
}