What does it mean to have at least one media query
`#navbar{position: fixed;top: 0;
left: 0;
height: 100%;
width:10%;
overflow: auto;
background-color: #fffff;
z-index: 9999;
margin: 0;}
main{width: 100%;
font-family: ‘Open Sans’, sans-serif;
margin:0px;
padding-left: 200px}
*{box-sizing: border-box;}
html{font-size: 18px;}`