Since LLGBO release 2.10

By default the tooltip management is automatic

• The Tooltip background color is based on #thePicturePage background
• The Tooltip border color is based on #thePicturePage color
• Tooltip size is based on thumbnail size + 20%

Via the css of the theme used you can set your own values

• #llgboTip #title , #llgboTip h3 {color:#d97b33 !important}
• #llgboTip {background-color:#323a41 !important;border:2px inset #dedede !important}