Thank you for your reply,
Could you have a check of the first code again, please?
I have tried to add the code to the theme options, however, the problem seems to be still existed.
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.menu .vc_custom_heading {
font-size: 12px !important;
}
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The text displays right on the medium to large screen, but it doesn’t work the same on the smaller resolution.
Thanks again
Regards
Graham