in powergallery/galleries/slideshow_dissolve_plain/css/themes/buffalotkdDissolve.css change:
#pgOuterWrapper {
margin: 20px auto;
}
to:
#pgOuterWrapper {
margin: 0 auto;
}
and in css/martial-arts-taekwondo.css change:
#bigimage {
border: 2px solid #E6BC58;
border-radius: 5px;
margin: 0 auto 20px;
width: 976px;
}
to:
#bigimage {
margin: 0 auto 20px;
width: 976px;
}