diff --git a/src/agenda_culturel/static/js/calendar-buttons.js b/src/agenda_culturel/static/js/calendar-buttons.js
index fe7acda..7f888c1 100644
--- a/src/agenda_culturel/static/js/calendar-buttons.js
+++ b/src/agenda_culturel/static/js/calendar-buttons.js
@@ -51,7 +51,7 @@ document.addEventListener("DOMContentLoaded", function(e) {
     document.querySelector('.slider-button-inside.button-left').addEventListener('click', function (event) {
         agenda = document.getElementById("calendar");
         grid   = agenda.querySelector(".grid");
-        agenda.scrollLeft -= grid.offsetWidth / 7;
+        agenda.scrollLeft -= 4 * agenda.offsetWidth / 5;
     }, false);
 
 
@@ -59,7 +59,7 @@ document.addEventListener("DOMContentLoaded", function(e) {
     document.querySelector('.slider-button-inside.button-right').addEventListener('click', function (event) {
         agenda = document.getElementById("calendar");
         grid   = agenda.querySelector(".grid");
-        agenda.scrollLeft += grid.offsetWidth / 7;
+        agenda.scrollLeft += 4 * agenda.offsetWidth / 5;
     }, false);
 
     // when the scroll stops, we adjust button visibility