fixed tooltip hover position.

Signed-off-by: root <root@ipekatrinadei.ipe.kit.edu>

static/style.css

@@ -125,7 +125,7 @@ span,
     /* customizable */
     background: black;
     width: 150px;
-    margin-top: -25px;
+    margin-top: -50px;
     margin-left: 20px;
 }