HTML does have CSS, which basically lets you style a page however the hell you want.
It does let you color via HEX codes, so I definitely wouldn’t call them “HTML codes”.
TODAY I FOUND A FEATURE! YOU CAN CHANGE OPACITY OF A DRAWING BY ADDING EXTRA NUMBAS; FOR EXAMPLE I ADDED 40 AND THE DRAWING LOOKED LIKE THIS; IT WORKS ON TEXT BOXES TOO!