in style.php (row 65) replace
background: #999 url("./styles/BBOOTS/theme/bootstrap/pattern/forum-backdrop.png");
with
background: #999 url("./styles/BBOOTS/theme/bootstrap/pattern/forum-backdrop.png") repeat fixed;
this will "fix" the background image
anyway nice theme, also the use of awesome font is a nice choose
regards
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