Codecademy Sample Solution: Codeyear Review clearing

/* sample solution to style.css */
#longer{
    float:left;
    width:30%;
    background:#66FFFF;
    padding:10px;
}

#shorter {
    background:#FFFF66;
    padding:10px;
}

ul {
    color:white;
    background:black;

}

li {
    padding:10px;
    font-family:Arial;
    display:inline; /* this puts them all on the same line */
}
   
#navbar {
    clear: both;
}