mynode/packages/editor/ProseMirror/styles/table.css

table .selectedCell {
	outline: 2px solid var(--joplin-text-selection-color);
}

/* Prevent table entries from having more spacing in the Rich Text Editor
   than in the note viewer. Unlike the note viewer, the Rich Text Editor
   always adds a <p> wrapper element around the table cells. */
th > p:only-child, td > p:only-child {
	margin: unset;
}

/* Tables used with ProseMirror do not have a thead, so zebra striping needs be styled separately to the global noteStyle css */
table tr:nth-child(odd) {
	background-color: var(--joplin-table-background-color);
}