.div-1 {
    background: green;
    font-family: serif;
 }

 .div-2 {
    background: white;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
 }

 .div-3 {
    background: red;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
 }