The BB code for increasing the font size is
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[size=number]...[/size]
. Since the information here is understood relatively, the number 100 is for the current setting and 120 would be an enlargement by 20%.
Typeface with 25% enlargement would then be
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[size=125]Example text with 25% enlargement [/size]
Example text with 25% enlargement
.
You can add this size to your entire text by placing the tag
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[size=125]
at the beginning of your text and the tag
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[/size]
at the very end.