Mon code:
<html>
<style type="text/css">
<head>
.animal{
font-family: Arial;
color: #E20A0A;
}
p {
color: #0737E8;
font-family: times new roman;
}
</style>
</head>
<body>
<p> Je suis un <span class="animal">Chien</span></p>
</body>
</html>Je suis un Chien
