Cant get my divs positioned correctly - css

Question

Honestly - CSS and Divs aint the thing i'm most familiar with. However, I thought that I had managed to make the template for my later design, but it turns out that everything tends to move a bit around for me..
In Chrome, things seems to work at first, but after refreshing a few times, the text "your position on page" jumps down to the next line. In firefox, things are just at the wrong places to begin with.
If possibly, I would also like a nod on, how to get a padding/margin between the position text and again between each line. When adding it now, it just moves everything to completely wrong places.
Demo: http://cityroast.dk
CSS:
section {
width: 100%;
height: 100%;
background: #e8ebef;
padding: 5px;
}
div#catcontainer {
width: 10%;
height: 100%;
float: left;
}
div#categories {
width: 100%;
height: 100%;
float: left;
}
div#ads {
width: 100%;
height: 100%
float: left;
display: box;
}
div#ads span {
font-family: Verdana;
font-size: 12;
text-align: left;
}
div#one {
width: 10%;
height: 80px;
float: left;
}
div#two {
width: 70%;
height: 80px;
background: aqua;
float: left;
text-align: center;
}
div#three {
width: 10%;
height: 80px;
background: red;
float: left;
text-align: right;
line-height: 80px;
}
div a {
text-decoration: none;
color: #000000;
font-family: Verdana;
font-size: 12px;
}
HTML:
<section>
<div id="catcontainer">
<div id="categories">
<ul>
<b>A menu</b>
<li>Something</li>
<li>Something2</li>
<li>Something3</li>
</ul>
</div>
</div>
<div id="ads">
<span>Your position on page</span>
<div id="one">A picture</div>
<div id="two"><b>Title</b></div>
<div id="three"><b>Details</b></div>
</div>
</section>
Obviously, the latter part of the code is echoed 5 times at the moment, to get the 5 lines.
Thanks already!