Lighten the mask over slideshow

I want to lighten the mask over slideshow and navigation so the logo is more visible. I cannot see where I would alter that.
thanks

cspgsl
Hi
Open template folder /css/custom.css file
create this file if it does not exist and add this code

.slideshow .img-bg {
    opacity: 0.2;
    filter: alpha(opacity=20);
}

increase the value of 0.2 and 20 to more, it will display the image more brighter.

I added it and changed the values but it does not make any difference

.slideshow .img-bg {
opacity: 1;
filter: alpha(opacity=50);
}

cspgsl
Hi
Kindly replace the code with this code

#acm-slideshow-89.slideshow .img-bg {
    opacity: .9;
    filter: alpha(opacity=90);
}

It should work and its dedicated for this module only.

that did it... thanks