horizontally sub menu should slide content down - css

Question

I have some issues with my horizontal menu. The main content should avoid the sub menu. So when the sub menu opens it should shove the main content down.
The html
<ul id="menu">
<li class="active">Menu1</li>
<li class="active">Menu2
<ul>
<li class="active">Sub 1</li>
<li class="active">Sub 2</li>
<li class="active">Sub 3</li>
<li class="active">Sub 4</li>
</ul>
</li>
and the css
#menu{
width: 100%;
margin-left:auto;
margin-right:auto;
padding: 15px 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: 3px;
border-radius: 3px;
-moz-box-shadow: 0 2px 1px #9c9c9c;
-webkit-box-shadow: 0 2px 1px #9c9c9c;
box-shadow: 0 2px 1px #9c9c9c;
min-width: 1100px;
position: relative;
clear: both;
text-align:center;
}
#menu li{
display: inline-block;
padding: 0 0 10px 0;
}
#menu a{
float: left;
padding: 0px 50px 0 0;
color: #999;
text-transform: uppercase;
font: bold 12px/25px Arial, Helvetica;
text-decoration: none;
text-shadow: 0 1px 0 #000;
height: 30px;
}
#menu li:hover > a{
color: #fafafa;
}
*html #menu li a:hover{ /* IE6 */
color: #fafafa;
}
#menu li:hover > ul {
display: block;
}
/* Sub-menu */
#menu ul{
width: 100%;
margin: 0px 0 0 0;
padding: 15px 0 0 0;
list-style: none;
display: none;
position: absolute;
top: 55px;
left: 0px;
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: 3px;
border-radius: 3px;
-moz-box-shadow: 0 2px 1px #9c9c9c;
-webkit-box-shadow: 0 2px 1px #9c9c9c;
box-shadow: 0 2px 1px #9c9c9c;
min-width: 1100px;
}
}
#menu ul li{
float: left;
padding: 0 0 10px 0;
position: relative;
}
#menu ul a{
float: left;
height: 30px;
padding: 0px 25px;
color: #999;
text-transform: uppercase;
font: bold 12px/25px Arial, Helvetica;
text-decoration: none;
text-shadow: 0 1px 0 #000;
}
#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);
}
/* Clear floated elements */
#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 */
I tried to change the #menu ul position to relative. But that messes up the whole style.
Anybody who likes to help me? =)
JSFIDDLE: http://jsfiddle.net/M8S3T/

Answer 1

The elements that are absolutely or fixed positioned are removed from the normal flow of the page. You must avoid position:absolute if you want to preserve the flow.
I try to make a quick example to show: http://jsfiddle.net/M8S3T/1/
#menu li{
float:left;
padding: 0 0 10px 0;
width:5em;
}
/* Sub-menu */
#menu ul{
width: 100%;
margin: 40px -80px 0;
padding: 15px 0 0 0;
list-style: none;
display: 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: 3px;
border-radius: 3px;
-moz-box-shadow: 0 2px 1px #9c9c9c;
-webkit-box-shadow: 0 2px 1px #9c9c9c;
box-shadow: 0 2px 1px #9c9c9c;
min-width: 1100px;
}
#menu li ul li {
float:left;
padding: 0 0 10px 0;
width: 10em;
}
#menu ul a{
float: none;
height: 30px;
padding: 0px 25px;
color: #999;
text-transform: uppercase;
font: bold 12px/25px Arial, Helvetica;
text-decoration: none;
text-shadow: 0 1px 0 #000;
}
I only post you the parts I have changed. With this you can play with the float, and if you use a fixed width for the list items it will work.