/* Comment syntax */

/* psure * applies to everything */
*{
    font-family: Arial, Helvetica, sans-serif;
}

div{
    margin: 40px 80px;
}

li{
    margin: 10px 10px;
}

/* ID (no two elements should have the same id) */
#document-unique{
    margin: auto;
    padding: 20px;
}

/* class (basically just a tag) */
.list{
    margin: auto;
}