To specify a color on the webpage, use the RGB mode to determine the R10/R/B, which is the intensity of the three primary colors of red/green/blue. Generally, the minimum intensity of each color is 0, the highest is 255, and usually expressed in hexadecimal values, then 255 corresponds to hexadecimal FF, and the three values are juxtaposed in order, starting with #.
For example, the color value "#FF0000" is red because the red value reaches the highest value of FF (ie 255 in decimal) and the other two colors have a intensity of zero. For example, "#FFFF00" indicates yellow, because when both red and green are maximum values, and blue is 0, yellow is produced.
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