How to change font-size of dropdown menu

Dear friends,

Would you please help me to figure out why this font-size won’t be changed?
i wanna enlarge font-size of dropdown fabrics menu as the list of fabrics size font is too small i think.

Here is my script of css-custom but it doesn’t work.

#nav-main .sf-dropdown-menu li{
	font-size:30px;
}

Need your help guys.
i know if it’s already discussed at previous topics, but already tried and searching everywhere ,the result i tried to my website is not working.
is that anything wrong with the script?

Here is the website i’m working on.
[ redundant link removed ]

very much appreciated if friends here want to help.

Thank you.

Regards

The page I need help with: [log in to see the link]



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