To remove the black bar over the team photo's, follow the steps below :
1. Open default.css file, which you can get at this location " /wp-content/themes/Lightflow/css/color/default.css "
2. In default.css file goto line number 1244. You will get this line " background-color : black; "
3. Remove line number 1244
That's it, the black bar will not there anymore. If you want to give any other color then just change the color.