how can remember color code?

Answer 1

Just remember a few. The color codes are in hexadecimal, every group of 2 digits corresponding to red, green, blue (rgb) in that order.

#FF0000 is red
#00FF00 is green
#0000FF is blue
#000000 is black
#7F7F7F is grey
#FFFFFF is white

Answer 2

Use the Advanced Color Picker Tool by Fronz-Tec:
https://code.sololearn.com/W6DV8SXHyf3P/#html

This can help you with the colors

Answer 3

There are also tools online that show u what hexadecimal u need for what color, there are like 16,000,000 or more variations, you won't remember even close

Answer 4

hexcodes