h1 {color: green}
h2 {color: red}

html, body {
    margin-top: 30px;
    height: 100%;
}
.fixed-top {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 1;
}
.contenuto{
    min-height: 95%;
    padding-bottom: 20px;

}
footer{
    padding: 40px;
    background-color: green;
    text-align: center;
}
.success {
background-color: rgba(0, 128, 0, 0.15);
padding: 10px;
text-align: center;
color: green;
border: 1px solid green;
border-radius: 3px;
}