fit the color of the menu background

I want to change the background color of the menu, or make it semi-transparent.
Thank you

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delinea
Hi
Add this code in custom.css file

.t3-mainnav.navbar-default {
    background-color: #22222259;}
.t3-header .container > .row {
    background-color: #22222259;}

change color codes as per needs.