html {
background-color: white;
height: 100%;
}
body {
width: 800px;
margin: 0 auto;
padding-top: 5px;
height: 100%;
}

header {
    background-color: blue;
    color: black;
    text-align: center;
    padding: 5px;
    font-size: 30px;
    display: block;
    width: 790px;
    font-family: Arial;
}
nav {
    font-size: 18px;
    float: left;
}
nav ul {
    background-color: yellow;
    height: 45px;
    width: 800px;
    padding: 0px;
    margin: 0 0 0 0;
    float: left;
    border-bottom: 1px solid #cccccc;
    list-style-type: none;
}
nav li {
    float: left;
}
nav li a {
    display: block;
    height: 25px;
    border-right: 1px solid #cccccc;
    padding: 12px 18px 8px 18px;
    vertical-align: middle;
}
a {
    color: black;
}
div {
    float:right;
}
section {
    width: 73%;
    display: inline-block;
    float: left;
    padding:10px;
    font-size: 30px;
}
aside {
    width: 17%;
    display: inline-block;
    float: right;
    vertical-align: top;
    background-color: yellow;
    font-size: 18px;
    padding: 8px;
    min-height: 100%;
}
aside ul {
    list-style-type: none;
}
footer {
    width: 790px;
    background-color:black;
    color:white;
    text-align:center;
    clear: both;
    padding:5px;
    display: block;
}
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