html {
    font-size: 62.5%; /* Taille par défaut ramené à 10px */
}
* {
    box-sizing: border-box;
}
body {
    font-size : 1.6rem; /* équivaut à 16px */
    line-height : 2.2rem;
    font-family: arial, sans-serif;
    color: #333333;
    width: 960px;
    margin: 0 auto;
}
.border {
    border: 1px solid #999999;
    padding: 20px;
}
.hide {
    display: none;
}
nav.border {
    padding: 0;
}
body >header,
nav,
footer {
    margin: 20px 0;
}
h1, h2, h3, h4, h5, h6 {
    margin: 0;
}
h1, h3 {
    text-transform: uppercase;
}
h1 {
    font-size: 6rem;
    line-height: 7.2rem;  
}
h2 {
    font-size: 3.6rem;
    line-height: 4.4rem;
}
h3 {
    font-size: 1.4rem;
}
nav a {
    color: #333333;
    text-decoration: none;
    display: block;
    padding: 10px;
}
nav a:hover {
    background: tomato;
    color: white;
}
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
article img {
    float: left;
    margin-right: 10px;
}
article header h2 + p {
    font-size: 1.2rem;
    margin-top: 0;
}
footer,
article header h2 + p {
    color: #999999;
}