Change title font size of WordPress Gallery

Question:

I am working for my client to build a WP site and they have purchased the Wonderplugin Video Gallery Commercial plugin. I have activated it and want to reduce the text size in the Title. I have attached a screengrab to this email, as the site is on a test site and cannot be viewed by anyone but me yet. Can you please let me know what to do?

Answer:

In Step 3, Options tab, click Advanced Options button, then enter the following text to the Advanced Options field:

data-titlecss="{color:#ffffff; font-size:12px; font-family:Armata, sans-serif, Arial; overflow:hidden; white-space:normal; text-align:left; padding:10px 0px;}"
data-descriptioncss="{color:#ffffff; font-size:10px; font-family:Armata, sans-serif, Arial; overflow:hidden; white-space:normal; text-align:left; padding:0px 0px 10px 0px;}"

A demo is as following: