css - Bg opacity only for color

Question

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???

Answer 1

如果你这样做，并编辑不透明度的最后一个数字：

background-color:rgba(200,200,200,0.5);