body {
background-color: lightblue;
font-family: Helvetica;
}

#main {
width: 80%;
max-width: 950px;
border: 1px gray solid;
margin: auto;
padding: 10px;
background-color: white;
border-radius: 10px;
}

#header {
margin-top: 0;
border: 2px solid black;
padding: 5px;
height: 100px;
background: black;
background-image: url("code.jpg");
color: white;
}