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How to integrate css code in your default style sheet?

Copy the default css code into your style sheet

#recent_photos_envelope{margin:0 0 20px 0;}
.recent_photo_image a {float:left;display:inline;margin:0 16px 15px 0;border:1px dashed #888;padding:5px}
.recent_photo_image a:hover {border:1px dashed #000}
#browsephotos{margin: 0 25px 10px 12px; float:right;}

Enable Use Custom CSS option in the widget admin

Make sure Custom CSS code textarea is blank (Should contain no spaces also)