Is there a color code for transparent in HTML?

Question

I\'m building a new website, and I\'m looking for a transparent navigation bar so the background is visible.

Answer 1

Yeah I think the best way to transparent the background colour (make opacity only for the background) is using

.style{
        background-color: rgba(100, 100, 100, 0.5);
}

Above statement 0.5 is the opacity value.

It only apply the opacity changes to the background colour (not all elements')

The "opacity" attribute in the CSS will transparent all the elements in the block.