diff --git a/public/style.css b/public/style.css
index c810ea6..5df0030 100644
--- a/public/style.css
+++ b/public/style.css
@@ -58,3 +58,33 @@ body {
     font-weight: bold;
 }
 
+/* MULTI-LEVEL DROPDOWNS FOR BOOTSTRAP */
+.dropdown-menu .sub-menu {
+    left: 100%;
+    position: absolute;
+    top: 0;
+    visibility: hidden;
+    margin-top: -1px;
+}
+.dropdown-menu  li:hover .sub-menu {
+    visibility: visible;
+    display: block;
+}
+.navbar .sub-menu:before {
+    border-bottom: 7px solid transparent;
+    border-left: none;
+    border-right: 7px solid rgba(0, 0, 0, 0.2);
+    border-top: 7px solid transparent;
+    left: -7px;
+    top: 10px;
+}
+.navbar .sub-menu:after {
+    border-top: 6px solid transparent;
+    border-left: none;
+    border-right: 6px solid #fff;
+    border-bottom: 6px solid transparent;
+    left: 10px;
+    top: 11px;
+    left: -6px;
+}
+/* END MULTI-LEVEL DROPDOWNS FOR BOOTSTRAP */