body {
    margin-left: 10px;
    margin-right: 10px;
    width: auto;
}

a {
    text-decoration: none;
    color: darkred;
}

a:hover {
    text-decoration: underline;
    color: red;
}

.top {
    float: right;
    text-decoration: none;
    color: green;
}

#head {
    width: auto;
    text-align: center;
    background-color: silver;
}

#menu {
    width: auto;
    background-color: silver;
    margin-top: 10px;
    margin-bottom: 10px;
}

#menu ul {
    list-style: none;
    padding: 0px;
    margin: 0px;
    text-align: center;
}

#menu ul a {
    display: inline-block;
    margin: 0 15px;
    text-decoration: none;
    color: darkgreen;
    background-color: darkgray;
    padding: 5px 10px;
}

#menu ul a:hover {
    color: mediumseagreen;
    background-color: gray;
}

#menu ul li {
    display: inline;
}

#col_gauche {
    box-sizing: border-box;
    width: 200px;
    float: left;
    background-color: gray;
    padding: 10px;
}

#col_droite {
    margin-right: 0;
    margin-left: 205px;
    width: auto;
    /*float: right;*/
    background-color: ivory;
    line-height: 1.5em;
    font-size: 0.9em;
    padding: 15px 30px;
}

.clear {
    clear: both;
}

#footer {
    width: auto;
    background-color: silver;
    color: seagreen;
    font-size: 0.8em;
    text-align: center;
    margin-top: 5px;
    padding-top: 5px;
    padding-bottom: 5px;
}

/* RESPONSIVE */
@media screen and (max-width: 720px) {
    #col_gauche {
	width: auto;
	float: none;
    }
    
    #col_droite {
	float: none;
	margin-left: 0;
	margin-right: 0;
	margin-top: 5px;
	
    }
    #menu ul {
	text-align: left;
    }
    
    #menu ul a {
	margin: 0 5px;
	padding: 5px 5px;
    }
}

@media screen and (max-width: 320px) {
    body {
	width: 320px;
    }