Example of CSS customization in Blogger.
Having slept too much, I wanted to have separators for my html tables. Google explains here how to add custom css. I introduced an arbitrary class name so it isn't applied to the blog theme itself, only inside posts when explicitly stated. table.withborder { border-collapse: collapse; } table.withborder td { border: 1px solid #624A93; } Then in the HTML editor simply annotate: <table class="withborder"> Implicit approach To avoid adding withborder everywhere, leverage the class used by blogger (there is no guarantee it won't break at some point, though). div.post table td { border: 1px dashed RebeccaPurple; }