I tried, but it’s not making a change. I did get to make the orbit wrapper lighter, centered, and the font to be black and the box full width.
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.orbit-wrapper .orbit-caption { font-size: 20px; font-color: #000000; !important; line-height: 30px !important; center: 30px !important; bottom: 30px !important;}
.orbit-wrapper .orbit-caption {background: #5A5A5A! important; opacity: 0.6 !important; max-width: 400px !important;}
#slogan { font-size: 18px !important; line-height: 20px !important; }