.top{
    background-color: #FF0000;
}

#fond{
    min-height: 600px;
    width: 800px;
    background-image: url("fond.jpg");
}

#Menu{
    float: left;
    min-height: 300px;
    width: 200px;
    background-color: #42f4dc;
}

#contenu{
    margin-left: 200px;
    min-height:600px;
    width: 550px;
    background-image: linear-gradient(to right,blue, green);

}