Fix issue #812

build/less/small-box.less

@@ -50,7 +50,7 @@
   }
 
   h3, p {
-    z-index: 5px;
+    z-index: 5;
   }
 
   // the icon

dist/css/AdminLTE.css

@@ -1480,7 +1480,7 @@ a:focus {
 }
 .small-box h3,
 .small-box p {
-  z-index: 5px;
+  z-index: 5;
 }
 .small-box .icon {
   -webkit-transition: all 0.3s linear;