I would like dropdown menu background colour to be 50% opacity, it that possible?

Site URL: https://thephotographyplace.co.uk

At the moment I have a number of dropdown items in the menu which is transparent. A couple of the pages are similar in colour to the text so the menu is difficult to read. I don't want a solid background but it is possible to create a background with opacity.

I'm using the following code to make the menu background transparent and have tried some opacity code variations to replace 'transparent' but without success. 

/* Change dropdown menu background */

.header-nav-folder-content {

   background: transparent

     !important;

Many thanks!

Cristian

What is access password?

Thanks, 

photoplace

Cristian

Add to Home > Design > Custom CSS

/* Dropdown color */
.header-nav-folder-content {
    background-color: rgba(0,0,0,0.5) !important;
}

Perfect! Thank you!