Altering & Adding HTML & CSS code
HTML and CSS code are the building blocks for your new website. We strongly advise that you only alter or add coding into these areas if you have a decent knowledge of how they work. Even a missing semi-colon can play havoc with your website, so it's important that you seek an experts opinion on how to move forward with this.
Because of the broad spectrum of what is possible when using HTML and CSS, Venture don't give any training or hints and tips on this section, but there plenty of other websites out there which do cover it, like www.w3schools.com, which might be able to help.