Add Color and Remove Color Stylings

[maliya241]

• [x] new color selector background does not correspond to color selector values
• [x] add remove button to first color selector when there is more than one color selector
• [x] remove remove button if there is only color left after color selector removal
• [ ] make add color button the same height
• [x] disable add color when there is an equal number of colors to table rows
• [x] fix not unique id for new color selector after removal of a previous color selector