diff --git a/css/less/workspace.less b/css/less/workspace.less
index 1102b877467f070f636483430eac02e5a055cbab..8d297f604ed917e30eafdd1751c01ad28fba44b8 100644
--- a/css/less/workspace.less
+++ b/css/less/workspace.less
@@ -28,6 +28,9 @@
 
     .remove-slot-option {
       position: absolute;
+      top: 0;
+      left: 0;
+      z-index: 1;
       margin: 10px;
       color: @gray;
       cursor: pointer;