Edit in JSFiddle

.miul
{
	font-size:10px;
	list-style:none;
	margin-left:-40px;
}
.miul li a
{
	text-decoration:none;
}

#sect_01
{
	width:100%;
	display:block;
}
/*
#mimenu ul
{
	list-style:none;
}

#mimenu li
{
	display:inline-block;
	color:white;
	font-size:14px;
	margin-right:10px
}

#mimenu  a
{
	color:white;
	text-decoration:none;
	padding: 25px 18px;
	display:block;
	background-color:#3d2f2f;
	-webkit-box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
	-moz-box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
	box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
}
*/
/*Menu */
#mimenu ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
	
}

#mimenu ul li {
    float: left;
	color:white;
	font-size:14px;
}

#mimenu  a {
    display: block;
    width: 130px;
	 height: 70px;
	 background-color: #3D2F2F;
	text-align:center;
	color:white;
	margin-right:10px;
	margin-top:20px;
	
	background-color:#3d2f2f;
	-webkit-box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
	-moz-box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
	box-shadow: 0px 5px 5px 0px rgba(0,0,0,0.75);
}

#top_menu a:link {
    text-decoration: none;
	color:white;
}

#top_menu a:visited {
    text-decoration: none;
	color:white;
}

#top_menu a:hover {
    text-decoration: none;
	color:white;
}

#top_menu a:active {
    text-decoration: none;
	color:white;
}

<div style="width:960px;display:block;" id="mimenu">
<ul class="nav menu miul">
<li class="item-101 current active">
<a href="/joomla31/">Somos</a>
</li>
<li class="item-103">
<a href="/joomla31/index.php/segunda-pagina">Segunda Página</a>
</li>
<li class="item-104">
<a href="#">Este es un texto largo para el menú</a>
</li>
</ul>

</div>