Custom CSS Not Working

I tried adding

#sab-gravatar{ float: left; margin: 0px 10px 10px 0; !important }

or

#sab-gravatar{ float: left; margin: 0px 10px 10px 0; }

To the custom CSS in SAB > Settings but I couldn’t get it to work. It seems as if the original CSS was still overriding my custom CSS. Can you tell me how to make this custom CSS work?

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