Hi Ron,

Firstly, I would like to sincerely apologize for the delayed response as we have been experiencing an unusually high number of tickets. I am sorry that it has taken longer than usual to respond to your concern and your patience is highly appreciated.

-

If you simply want all images in your table to have the same border you can add this CSS  to the table's Customize/Custom CSS :

.wpDataTablesWrapper table.wpDataTable  tr td img {
 border : 5px solid green !important;

}

If you need some CSS to affect all your tables, add it to the main Plugin settings/Custom JS and CSS/Custom CSS.

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Or if you need different style for different columns with images, 

you can add a custom CSS class to a Column first, in the Display tab :

In my example i name the class "customimage",

so my CSS will be :

.wpDataTablesWrapper table.wpDataTable  tr td.customimage img {
 border : 5px solid green !important;
}

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If you want to 'target' by an original Header name of the Column, you can try this CSS :

.wpDataTablesWrapper table.wpDataTable  tr td.column-profileimage img {
    
    border : 5px solid green !important;
}

In my case, the column name's origin Header was "profileimage" so after the td.column- part you can input the Column name followed by img if you just wish to have a specific border for that Column of that table.

Let me know if that helps.