Weebly employees are not able to assist with code edits, but thanks for posting a link to your site as another user may be able to help you out. If you do edit the css/html area of your theme your site would be considered a "custom" theme. It's possible you may not be able to receive assistance from support unless you revert back to a standard Weebly theme. If you are able to add the css override to Settings>SEO>Header your site will still be a standard Weebly theme and it is much easier to troubleshoot. I.e. if you run into an issue, you can remove the code, see if the issues resolves, and the paste it back if the override was not the cause. Just something to think about when you are making these types of edits. 
