body {
    text-align: center;
}

a {
    color: red;
    border: 2px solid black;
}

li {
    display: inline;
}

table {
    border: 3px solid blue;
}

.balise {
    background-color: lightblue;
    text-align: left;
    width: 33%;
    margin-left: auto;
    margin-right: auto;
    color: green;
}

#link {
    background-color: lightgrey;
}

#richard {
    color: lightgrey;
    background-image: url("./220px-Richard_Stallman_2005_(chrys).jpg");
    background-color: #cccccc; /* Used if the image is unavailable */
    height: 500px; /* You must set a specified height */
    background-position: center; /* Center the image */
    background-repeat: no-repeat; /* Do not repeat the image */
    background-size: cover;
}