To match my theme color, I edited
#spMainContainer .spEditor table, #spMainContainer .spEditor tr, #spMainContainer .spEditor td { background-color: #cccccc; }
A few buttons with an arrow like Text Colot and Spell Checker seems to have a transparent background because those 2 are now the same color as I’ve set, but all remaining are light-blue.
Can we change background color for all buttons, or, fix the buttons with transparent background?