Pulling out my hair-Please help!!!

ok I was updating css-just changing the font color and all of a sudden the font got small and the font got dark and I cant find where I went wrong. Now every time I try to change something nothing happens.

Also the header is not working in firefox or iphone. I have tried renaming it one of the headers already available and nothing.

Please please please help!

Theme used: twenty ten
Site in question https://iselaespanadesignstudio.com/terms-conditions/