Copyrights line and header transparency

Hi

1. How do I change the length and width of the copyrights line?
Like the attached image.

2. How do I change the header transparency? (I just want to change the transparency of the header, not its color)
I change the code below, but the page title changes!

body .website-wrapper header{
    background-color:rgba(255,255,255,0.8) !important;
}