5px extra margin getting added to the bottom of each div

Question

I am trying to design a simple header to a page in css. I planned to stack two divs on top of each other. The top one has many tabs and the bottom one is a plain solid singl

Answer 1

You need to specify units on your CSS declarations.

http://jsfiddle.net/m7YCW/

div.main_nav
{ 
    display: inline-block;
    height: 25px;       /* set px */
    width: 900;
    padding: 0;
    margin: 0;
    vertical-align: bottom;    
}

Learn to make use of your developer tools in Chrome, if you had right mouse buttoned on the elements and chosen -> inspect it would bring up the dev tools. You can then view the 'metrics' and 'computed styles' areas to see that main_nav was rendering as 30px instead of 25px and also that there was a warning symbol next to the 25 css declaration and it was being explicitly dropped.