Ways to declare Colors in CSS (Image by - Sharma Guides | Subham232330) 1. Color Name 2. Hex Value 3. RGB() and RGBA() 4. HSL() and HSLA() 5. HWB() * Color Name:- background-color:red; * HEX Value:- background-color:#001122; * RGB():- background-color:rgb(25,31,52); * RGBA():- background-color:rgba(0,0,0,1.5); | Transparency The hexadecimal system uses values from 0 to 255 but in RGB we can use 0% to 100% as well.