body {
    width: 100%;
    margin: 0;
    padding: 0;
    font-family: "Times New Roman", Times, serif;
}

header {
    background-color: #666;
    height: 100px; 
    line-height: 100px; 
    font-size: 35px;
    text-align: center;
    color: white;
}

.container {
    width: 100%;
}

nav {
    float: left;
    width: 30%;
    height: 300px;
    background-color: #cccccc; 
    padding: 20px;
    box-sizing: border-box; 
}

nav ul {
    list-style-type: none;
    padding: 0;
}

nav ul li {
    margin-bottom: 5px;
}

nav a {
    color: #0000ee;
    text-decoration: underline;
}

article {
    float: left;
    width: 70%;
    height: 300px;
    background-color: #ffffff;
    padding: 20px;
    box-sizing: border-box;
    text-align: justify;
}

article h1 {
    font-size: 20px;
    margin-top: 0;
}

footer {
    background-color: #777;
    color: white;
    text-align: center;
    padding: 10px;
    clear: both;
}

.clear {
    clear: both;
}