How to Add border for first row table?
Move to CSS editor in your plugin setting
Now you see CSS styles.
Use this code for add border bottom row:
#supsystic-table-ID thead th { border-bottom: 2px solid black; }
Where ID – your table ID
More style you can find on pages:
https://www.w3schools.com/cssref/pr_border-bottom.asp
https://www.w3schools.com/cssref/pr_border-top.asp
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