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RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity for a color.
An RGBA color value is specified with: rgba(red, green, blue, alpha). The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).
rgba(255, 0, 0, 0.4);
rgba(255, 0, 0, 0.8);
The following example defines different RGBA colors:
Example
#p1 {background-color: rgba(255, 0, 0, 0.3);} /* red with opacity */ #p2 {background-color: rgba(0, 255, 0, 0.3);} /* green with opacity */ #p3 {background-color: rgba(0, 0, 255, 0.3);} /* blue with opacity */
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HSL Colors
HSL stands for Hue, Saturation and Lightness.
An HSL color value is specified with: hsl(hue, saturation, lightness).
Hue is a degree on the color wheel (from 0 to 360):
0 (or 360) is red
120 is green
240 is blue
Saturation is a percentage value: 100% is the full color.
Lightness is also a percentage; 0% is dark (black) and 100% is white.
hsl(0, 100%, 30%);
hsl(0, 100%, 70%);
The following example defines different HSL colors:
Example
#p1 {background-color: hsl(120, 100%, 50%);} /* green */ #p2 {background-color: hsl(120, 100%, 75%);} /* light green */ #p3 {background-color: hsl(120, 100%, 25%);} /* dark green */ #p4 {background-color: hsl(120, 60%, 70%);} /* pastel green */
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HSLA Colors
HSLA color values are an extension of HSL color values with an alpha channel - which specifies the opacity for a color.
An HSLA color value is specified with: hsla(hue, saturation, lightness, alpha), where the alpha parameter defines the opacity. The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).
hsla(0, 100%, 50%, 0.3);
hsla(0, 100%, 90%, 0.3);
The following example defines different HSLA colors:
Example
#p1 {background-color: hsla(120, 100%, 50%, 0.3);} /* green with opacity */ #p2 {background-color: hsla(120, 100%, 75%, 0.3);} /* light green with opacity */ #p3 {background-color: hsla(120, 100%, 25%, 0.3);} /* dark green with opacity */ #p4 {background-color: hsla(120, 60%, 70%, 0.3);} /* pastel green with opacity */
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Opacity
The CSS opacity property sets the opacity for the whole element (both background color and text will be opaque/transparent).
Notice that the text above will also be transparent/opaque!
The following example shows different elements with opacity:
Example
#p1 {background-color:rgb(255,0,0);opacity:0.6;} /* red with opacity */ #p2 {background-color:rgb(0,255,0);opacity:0.6;} /* green with opacity */ #p3 {background-color:rgb(0,0,255);opacity:0.6;} /* blue with opacity */
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Test Yourself with Exercises!
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