How to indent multiple levels of select optgroup with CSS?

Question

Just trying to indent optgroup blocks by nesting depth really, I\'ve tried a general margin-left rule, nested elements then trying to apply the same rule, tried

Answer 1

It's amazingly simple than styling. The answer came to me afte hours of strugling :)) . The optgroup and option tags are defining strings in read-only mode, actualy. So for you to indent any of the optgroup or option content, you just use simple space in the names or  .

It's that simple :) !