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CSS in HTML5

Example 
header, footer, section, article {
    border: 1px black;
    margin: 8px;
    margin-bottom: 18px;
    padding: 10px;
    background-color: red;
}

header, footer {
    color: white;
    background-color: #445;
    margin-bottom: 8px;
}

section {
    background-color: #ddf;
}

nav ul  {
    margin: 0;
    padding: 1;
}

nav ul li {
    display: inline; 
    margin: 8px;
}