Question

Possible Duplicate:
Why does overflow hidden stop floating elements escaping their container?

Why my div element has not been show inside my ul and li?
Why my li is acting as inline element if I set that it is block?
Take a look at this code:
http://jsfiddle.net/jNkZP/

Answer 1

Your divs are floating inside the lis. When an element contains nothing but floating objects, it collapses. More eloquently put:

When a float is contained within a container box that has a visible border or background, that float does not automatically force the container’s bottom edge down as the float is made taller. Instead the float is ignored by the container and will hang down out of the container bottom like a flag. Those familiar only with Explorer for Windows may scratch their heads and say “That’s not right!” True, IE/Win does enclose a float within a container ‘automatically’, but only if the container element happens to possess the MS-only quality called hasLayout.

http://www.positioniseverything.net/easyclearing.html

Solution: Look into clearfix or any of its alternatives.

For example, I used overflow: hidden; to demonstrate my point: http://jsfiddle.net/jNkZP/23/

#QuadroEvento ul.ListaDadosEvento li{
    display: block;
    position: relative;
    background-color: #722827;
    outline: blue solid 1px;
    overflow: hidden;
}