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The slider text is white by default, and can be hard to read on light images (conversely, dark text would be hard to read on dark images; there’s always a trade-off).
I added some custom CSS to give a bit of a drop-shadow:
Dashboard >> Appearance >> Theme Options >> Styling Options >> [scroll to bottom for] Custom CSS:
text-shadow: 1px 1px 0.1em #333;
filter: glow(color=black, strength=2);
Drop shadows are a bit ugly in IE
I used code suggested by http://www.impressivewebs.com/css3-text-shadow-ie/
I’ve run into some issues with icons in the footer, and elsewhere.
I’ve added to an existing ticket