H1,H2 headings are to big

At the top your css (did you paste it twice??), you have:

Code:

h1, h2, h3, h4, h5, h6, pre, code, address, caption, cite, code, em, strong, th {font-size: 1em; font-weight: normal; font-style: normal;}

Further down, you have:

Code:

h1 { font-size: 2.25em; }
h2 { font-size: 1.8em; }
h3 { font-size: 1.45em; }
h4 { font-size: 1.2em; }
h5 { font-size: 1em; }
h6 { font-size: .8em; line-height:2em;}

Those later settings overwrite the settings at the top.

Please, if you share code, put it inside code or php tags (there are buttons for that on the button bar of the text editor). Here, I used the Code button. Php code looks like this if it's inside the right tags:

PHP Code:

$title = 'This is my website';
echo $title;