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


.form {
    background: 
        radial-gradient(circle at 50% 100%, rgba(253, 224, 71, 0.4) 0%, transparent 60%),
        radial-gradient(circle at 50% 100%, rgba(251, 191, 36, 0.4) 0%, transparent 70%),
        radial-gradient(circle at 50% 100%, rgba(244, 114, 182, 0.5) 0%, transparent 80%);
}