Please complete the following steps:
1) Go to the plugin settings page and open "Custom Code" tab;
2) Mark "Activate custom CSS code" checkbox in "CSS" section and insert the following code:
.gllr_image_row .gllr_single_image_text { font-size: 15px; color: #444; }
3) Save changes.
This article related to Galley by BestWebSoft plugin
Additional resources: Gallery - User Guide
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