this is not a bug nor a feature, it's simply how CSS works. You're assigning styles to the container object (the text object) trying to alter its children (paragraphs and span nodes): those styles will be applied unless more specific ones are present. Probably the font size is being overridden by inline styles or by another, more specific class (in this case it's probably the default
.SCText p class).
The quickest solution is appending an
!important directive to the font-size property (or whatever property that is not being applied):
font-size: 120px !important;
I hope this is helpful.