On your
http://www.slothmud.org/themes/SlothIII/style/style.css add the following:
body {
margin: 0;
background: url(../images/slothIII_mainbg_full.jpg) repeat;
}
that should replace that black space with the same bg that's in the page background.. although the edges wont line up, but may look better than the blackness.
You could ALTERNATIVELY try this to center everything.. it may or may not work depending on a few other things, but worth a try.
body {
margin: 0 auto; /* center on everything else */
text-align: center; /* center on ie */
padding: 0; /* setting border: 0 hoses ie5 win window inner well border */
background: url(../images/slothIII_mainbg_full.jpg) repeat;
}
html {
margin: 0; /* setting border: 0 hoses ie5 win window inner well border */
padding: 0;
}