Fix dark theme background of lead paragraph (#361)

Author: ByteHamster

_sass/_dark.scss

@@ -138,11 +138,15 @@
     }
 
     .modal-footer {
-      border-top: 0;
+        border-top: 0;
+    }
+
+    .alert-warning {
+        background-color: #fff3cd0a;
+    }
+
+    .lead {
+        background-color: #223;
     }
-	
-	.alert-warning {
-	  background-color: #fff3cd0a;
-	}
 
 }