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

Ege's answer was very useful for me. I have spent hours to find the reason of a bottom padding of some images in div's. It was the line-height. Set it to 0px on the interesting areas:

.divclass {
    line-height: 0px; /* crucial for bottom padding 0 !!! */
}