Positioning and Floating aren't working? - html

Question

I've tried numerous of things to fix this. I cannot seem to get the nested div inside the parent div without having to use margin. I'm trying to get it in the regular way which is position:relative on parent and position:absolute on nested. It's not working though, anybody know why?
HTML
<div class="header">
<div class="logo">
<img src="/images/logo.png" width="96" height="82">
</div>
<div id="nav">
Portfolio
About
Contact
</div>
<div id="headerPro">
</div>
</div>
CSS
.header {
position:relative;
background-color: #2C2E31;
border-bottom: #242426 2px solid;
height: 182px;
}
.logo {
text-align: center;
padding-top: 35px;
}
#nav {
position:absolute;
bottom: 0;
width: 100%;
text-align:center;
text-decoration:none;
font-size:20px;
font-family:raleway-regular;
}
#nav a {
border-bottom:#FFFFFF 2px solid;
color:#FFFFFF;
text-decoration:none;
margin-left: 8px;
margin-right:8px;
}
#headerPro {
position:absolute;
float:right;
width:100px;
height:100px;
background-color:red;
}

Answer 1

It's hard to tell what exactly you want it to look like, but maybe I got you right:
I revised your HTML code to use ul for the nav which is best practice:
<div class="header">
<div class="logo">
<img src="/images/logo.png" alt="logo"/>
</div>
<ul id="nav">
<li>Portfolio</li>
<li>About</li>
<li>Contact</li>
</ul>
<div id="headerPro">
</div>
</div>
With that your css code could look like that:
.logo > img {
display: inline-block;
width: 96px;
height: 82px;
}
#nav {
position:absolute;
list-style-type: none;
bottom: 0;
width: 100%;
text-align:center;
text-decoration:none;
font-size:20px;
font-family:raleway-regular;
}
#nav > li {
display: inline;
}
#headerPro {
position:absolute;
top: 35px; /* assuming you want this to line up with the logo */
right: 0;
width:100px;
height:100px;
background-color:red;
}
Here is a demo.

Answer 2

See this fiddle
Example
I have made two changes added a float:left to the logo css:
.logo {
float:left;
}
and removed the position:absolute from the header pro css
Your div is flowing outside the header block because of the logo div, if you make that float left (as I have done in the fiddle) the Red Div will move up.
It would help if you could explain exactly where you want the #HeaderPro div..

Answer 3

Apparently the browser positions your div#headerPro just below the previous(sibling) div. If you want it to be part of the parent div, add top:2% to position the red div in the top right corner of the black div.
#headerPro {
position:absolute;
float:right;
width:100px;
height:100px;
background-color:red;
top: 1%;
}