I'm having a border problem. I want a heading to have a fat 10px left yellow border and a 1px #555 top and bottom borders. The problem is that the top 1px border overwrites the left border while the bottom one does not. So, the 10px of yellow have a 1 px line on top.
I'm not sure if there's a fix for that, however you can fake it by creating an image with the yellow left border and the top border, and set that as the background for the heading.
Then all you need to do is give it a border bottom and you'll have the desired effect.