body {
    background-size: cover;
    background-repeat: no-repeat;
    font-size: 16px;
    /* = valeur de em */
}

html {
    font-family: "Arial", sanserif;
}

/*
a {
    text-decoration: none;
    font-size: 1em;
    color: rgba(25, 25, 25, 1);
}
*/
a:hover {
    color: red;
}

a:focus {
    border: none;
}