diff --git a/sppa/calc/index.html b/sppa/calc/index.html
index 24b1c624..c2067cb1 100644
--- a/sppa/calc/index.html
+++ b/sppa/calc/index.html
@@ -21,6 +21,7 @@
     table {
       width: 80%; 
       border-collapse: collapse;
+      margin:0;
     }
 button {
   font-size:30px;