Fix sponsor background on landing page (#3721)

Author: haslinghuis

src/css/tabs/landing.less

@@ -6,7 +6,6 @@
 		min-height: 100%;
 		height: 100%;
 		overflow-y: auto;
-		background-color: #2e2e2e;
 	}
 	.content_top {
 		height: 140px;