body {
    padding: 0;
    margin: 0;
    font-size: 15px;
}

header {
    border-bottom: 1px solid #000000;
    padding-top: 10px;
    padding-bottom: 10px;
    margin: 0;
}

header h1 {
    text-align: center;
    font-size: 200%;
}

.yoko h2 {
    float: left;
    margin: 0;
    padding: 14px 16px;
    background-color: #92d050;
    text-align: center;
    font-size: 100%;
}

.yoko ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #f0f0f0;
}

.yoko li {
    float: left;
}

.yoko a {
    display: block;
    color: #000;
    padding: 14px 16px;
    text-decoration: none;
    min-width: 100px;
    text-align: center;
}

.yoko a:hover {
    background-color: #555;
    color: #fff;
}

article {
    margin: 10px;
}

footer {
    clear: both;
    border-top: 1px solid black;
    padding: 10px;
    font-style: italic;
    text-align: right;
}