admin navi fix

admin.css

@@ -7,3 +7,16 @@ form .label {
   float: left;
   width: 200px;
 }
+
+.admin_navi {
+  display: block;
+  width: 100%;
+  border-bottom: 1px solid #000;
+  overflow: overlay;
+}
+
+.admin_navi li {
+  display: block;
+  float: left;
+  margin: 0 10px;
+}