custom css

I probably di something stupid. I tried to change color by using the custom css and put in the following code:
#main-inner-wrapper a { color: #336699; }

It didn’t solved the problem and I deleted it from the custom css in Highend.
Since then i’m getting an error with my embedded you tube video that the url is not valid. However it worked perfect before the css input and it stil works if I’m using the lightbox option. So the link doesn’t seem to be the problem.
Is the code I put in still somewhere disturbing the video embedding?
Can you please help to solve the problem?