html {
    background-color: #f99;
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    color: #333;
    font-size: 15px;
}
body {
    margin: 20px auto;
    background-color: #fff;
    width: 800px;
    border: 1px solid #333;
}
header {
    background-color: #ffc;
}
h1 {
    margin: 0;
    padding: 20px;
}
nav ul {
    display: flex;
    justify-content: space-around;
    margin: 0; padding: 0;
}
nav ul li {
    display: block;
    flex-grow: 1;
    font-size: 25px;
    background-color: #f66;
    text-align: center;
    padding: 10px;
}
nav ul li:hover { background-color: #f99; }
nav ul li a {
    color: #fff;
}
main { border: 1px solid #333; border-width: 1px 0px; }
section {
    background-color: #fc9;
    padding: 10px;
    border: 1px solid #333;
    margin: 20px;
}
footer {
    background-color: #f66;
    color: #fff;
    padding: 10px;
    text-align: right;
}
a { color: #9f0; }
h2 {
    color: #630;
    border-left: 10px solid #f90;
    border-bottom: 1px solid #f90;
    background-color: #ffc;
    padding: 2px;
    padding-left: 5px;
}