Body border is the outer border of a wiki. Customized here on MediaWiki:Wikia.css

Shadow Border

/* Shadow Border Wiki */
.WikiaPage {
	box-shadow: 0px 0px 50px #800000;
	-moz-border-radius: 0px;
	border-radius: 0px;
}

Inner Gradient Background

/* Page Background */
.WikiaPageBackground,
.WikiaPageContentWrapper {
background: #e0f3fa; /* Old browsers */
background: -moz-linear-gradient(-45deg,  #e0f3fa 0%, #d8f0fc 40%, #b8e2f6 65%, #b6dffd 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right bottom, color-stop(0%,#e0f3fa), color-stop(40%,#d8f0fc), color-stop(65%,#b8e2f6), color-stop(100%,#b6dffd)); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(-45deg,  #e0f3fa 0%,#d8f0fc 40%,#b8e2f6 65%,#b6dffd 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(-45deg,  #e0f3fa 0%,#d8f0fc 40%,#b8e2f6 65%,#b6dffd 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(-45deg,  #e0f3fa 0%,#d8f0fc 40%,#b8e2f6 65%,#b6dffd 100%); /* IE10+ */
background: linear-gradient(135deg,  #e0f3fa 0%,#d8f0fc 40%,#b8e2f6 65%,#b6dffd 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#e0f3fa', endColorstr='#b6dffd',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
}
 
.WikiaPage {
    border:none;
}