Editing Templates (section)

==== Custom HTML ====
The HTML option gives you complete control over the design of your template. However, you must be familiar with HTML and CSS to create this kind of template. If you aren’t familiar with HTML and CSS code, but still want an appealing visual design for your email, you might want to use one of the templates described above. Emails that use an HTML template should be previewed before sending so that you can be sure your campaign displays correctly in the most popular email clients and on mobile devices. To avoid display issues, you may want to use our templates above which have been carefully optimized to display correctly across popular devices and email clients.