diff --git a/sppa/calc/index.html b/sppa/calc/index.html
index 79324b09..1c4ede7a 100644
--- a/sppa/calc/index.html
+++ b/sppa/calc/index.html
@@ -18,6 +18,11 @@
   margin-right: auto !important;
   text-align: center !important;
 }
+    table {
+      width: 80%; 
+      border-collapse: collapse;
+    }
+
 
   </style>
 </head>