Menu déroulant (Créer un compte)

<div>
<ul id="menu">
 	<li><a>Vidéos des matchs</a>
<ul>
 	<li><a href="https://wpfr.net/support/sujet/menu-deroulant-31/#post-1733243">Namur/Namur</a></li>
 	<li><a href="https://wpfr.net/support/sujet/menu-deroulant-31/#post-1733243">Namur/PSG</a></li>
 	<li><a href="https://wpfr.net/support/sujet/menu-deroulant-31/#post-1733243">Namur/Liège</a></li>
 	<li><a href="https://wpfr.net/support/sujet/menu-deroulant-31/#post-1733243">Namur Charleroi</a></li>
</ul>
</li>
</ul>
</div>

/* Principal */
#menu{
        width: 100%;
        margin: 0;
        padding: 10px 0 0 0;
        list-style: none;
        background: #111;
        background: -moz-linear-gradient(#444, #111);
        background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
        background: -webkit-linear-gradient(#444, #111);
        background: -o-linear-gradient(#444, #111);
        background: -ms-linear-gradient(#444, #111);
        background: linear-gradient(#444, #111);
        -moz-border-radius: 50px;
        border-radius: 10px;
        -moz-box-shadow: 0 2px 1px #9c9c9c;
        -webkit-box-shadow: 0 2px 1px #9c9c9c;
        box-shadow: 0 2px 1px #9c9c9c;
}

#menu li{
        float: left;
        padding: 0 0 10px 0;
        position: relative;
		width: 100%;
}

#menu a{
        float: left;
        height: 25px;
        padding: 0 10px;
        color: #999;
        text-transform: uppercase;
        font: bold 12px/25px Arial, Helvetica;
        text-decoration: none;
        text-shadow: 0 1px 0 #000;
}

#menu li:hover > a{
        color: #fafafa;
}

*html #menu li a:hover{ /* IE6 */
        color: #fafafa;
}

#menu li:hover > ul{
        display: block;
}

/* Sous-menu */

#menu ul{
	width: 100%;
    list-style: none;
    margin: 0;
    padding: 0;
    display: none;
    position: absolute;
    top: 35px;
    left: 0;
    z-index: 99999;
    background: #444;
    background: -moz-linear-gradient(#444, #111);
    background: -webkit-gradient(linear,left bottom,left top,color-stop(0, #111),color-stop(1, #444));
    background: -webkit-linear-gradient(#444, #111);
    background: -o-linear-gradient(#444, #111);
    background: -ms-linear-gradient(#444, #111);
    background: linear-gradient(#444, #111);
    -moz-border-radius: 5px;
    border-radius: 5px;
}

#menu ul li{
	width: 100%;
    float: none;
    margin: 0;
    padding: 0;
    display: block;
    -moz-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
    -webkit-box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
    box-shadow: 0 1px 0 #111111, 0 2px 0 #777777;
}

#menu ul li:last-child{
    -moz-box-shadow: none;
    -webkit-box-shadow: none;
    box-shadow: none;
}

#menu ul a{
    padding: 10px;
    height: auto;
    line-height: 1;
    display: block;
    white-space: nowrap;
    float: none;
    text-transform: none;
}

*html #menu ul a{ /* IE6 */
        height: 10px;
        width: 150px;
}

*:first-child+html #menu ul a{ /* IE7 */
        height: 10px;
        width: 150px;
}

#menu ul a:hover{
        background: #0186ba;
        background: -moz-linear-gradient(#04acec,  #0186ba);
        background: -webkit-gradient(linear, left top, left bottom, from(#04acec), to(#0186ba));
        background: -webkit-linear-gradient(#04acec,  #0186ba);
        background: -o-linear-gradient(#04acec,  #0186ba);
        background: -ms-linear-gradient(#04acec,  #0186ba);
        background: linear-gradient(#04acec,  #0186ba);
}

#menu ul li:first-child a{
    -moz-border-radius: 5px 5px 0 0;
    -webkit-border-radius: 5px 5px 0 0;
    border-radius: 5px 5px 0 0;
}

#menu ul li:first-child a:after{
    content: '';
    position: absolute;
    left: 30px;
    top: -8px;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 8px solid #444;
}

#menu ul li:first-child a:hover:after{
    border-bottom-color: #04acec;
}

#menu ul li:last-child a{
    -moz-border-radius: 0 0 5px 5px;
    -webkit-border-radius: 0 0 5px 5px;
    border-radius: 0 0 5px 5px;
}

/* Rétablissement du flottement */
#menu:after{
        visibility: hidden;
        display: block;
        font-size: 0;
        content: " ";
        clear: both;
        height: 0;
}

* html #menu             { zoom: 1; } /* IE6 */
*:first-child+html #menu { zoom: 1; } /* IE7 */