h1 {
    background-color:red;
    margin: 30px;
}
h2 {
            color: blueviolet;
            background-color: azure;
            text-align: center; 
            margin: 30px; 
            padding: 15px; 
            font-family: Arial, Helvetica, sans-serif
        }
body {
    background-color: rgba(222, 111, 222, 0.675);
}
#titolo_principale{
    color: #005C53;
}
.prova{
    color: green;
}
p{font-weight: bold;}
.red{color: red;}
p{font-size: italic;}