Bg opacity only for color

Problem

Here i have a Background like this

background:url(../img/arrow_lch.png) right no-repeat #2e443a;

I have to reduce only bg color(#2e443a) Opacity, How???

Problem courtesy of: Anil Vinayak

Solution

If you do it this way, and edit the last number for opacity:

background-color:rgba(200,200,200,0.5);
Solution courtesy of: SaturnsEye

Discussion

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