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/* PNG images used to be required for creating any kind of transparency effects 
in web design, but thanks to another advance in CSS transparency can now be created 
with the help of the RGBa color mode. Using RGBa in place of a hex value allows you 
to select a colour using its red, green and blue channels as well as setting an 
alpha level, such as 0.5 for 50% opacity. */

.btn {
	color: rgba(0,0,0,0.5);
}