bad: for dummies who do not understand the styles and css, it is simply become not possible to make a design that you want
good: you can quickly find the place where you need to make changes.
how: you can at least bring it to the editor class with a hint, right under the field where you try to enter your margin value, for example, say that such and such a class sets the value here, go right here, you can link to it too.