Solved
CSS for Selected Grid Cell - 9.3.4
Remove or Change the selected cell's border in runtime,

In runtime, i'm seeing CSS as follows,

How to apply in Custom CSS tab? I don't find any configurations to change the border color.
Remove or Change the selected cell's border in runtime,

In runtime, i'm seeing CSS as follows,

How to apply in Custom CSS tab? I don't find any configurations to change the border color.
I was able to override the color using this in the mashups custom css tab:
ptcs-focus-overlay {
border-color: red !important;
}

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