diff --git a/web/sketcher.html b/web/sketcher.html
index 74f2203d..591670eb 100644
--- a/web/sketcher.html
+++ b/web/sketcher.html
@@ -46,7 +46,7 @@
     <div id="dock" class="panel b-right scroll" style="float: left; width: 245px; height: 100%;"></div>
     <div id="right-toolbar" class="panel b-left scroll" style="width: 50px; float: right; height: 100%; ">
       <div style="width:50%; height: 2px"></div>  
-      <button class="btn rbtn act-coincident" style="background-image: url(img/coi.png);">SS</button>
+      <button class="btn rbtn act-coincident" style="background-image: url(img/coi.png);"></button>
       <button class="btn rbtn act-verticalConstraint" style="background-image: url(img/vert.png);"></button>
       <button class="btn rbtn act-horizontalConstraint" style="background-image: url(img/hor.png);"></button>
       <button class="btn rbtn act-parallelConstraint" style="background-image: url(img/par.png);"></button>