I have had request to customize the font-size of BI publisher prompt-parameter labels, please follow the steps below.
1) Locate the file “blafplus-rich.css” from the path below.
\OBIEE\user_projects\domains\bifoundation_domain\servers\bi_server1\tmp\_WL_user\bipublisher_11.1.1\to5gma\war\xdo\styles
2) In the above .css file, you would notice the class .prompt {} as shown; the default font-size is 11.
.prompt {font-family:Tahoma,sans-serif;font-size:11px;font-weight:normal;color:#704A00;vertical-align: baseline;}
3) Set the required font-size, save as this file blafplus-rich.css in the same folder. Be sure to backup the css file.
Below are the screenshots of prompt labels before and after updating font-size.
