Les boutons pour soumettre un evt sont graphiquement plus travaillés

app/assets/stylesheets/all.css.sass

@@ -163,9 +163,9 @@ label
   border: 1px solid darkgray
   +box-shadow(1px 1px 2px lightgray)
   +border-radius(0.4em)
-input, textarea, select, a.button, .select2-container ul
+input, textarea, select, a.button, button, .select2-container ul
   color: black
-  margin: 3px 0
+  margin: 3px
   border: 1px solid darkgray
   outline: none
   padding: 2px 4px
@@ -181,7 +181,7 @@ input, textarea, select, a.button, .select2-container ul
     +box-shadow(none)
   &[type=radio] + label
     text-align: left
-  &[type=submit], &.button
+  &[type=submit], &.button, button
     color: black
     border: none
     cursor: pointer

app/views/events/_form.html.haml

@@ -72,5 +72,9 @@
     = f.text_field :tags, size: 70
 
   .actions
-    = f.submit t('.visualise'), formaction: :preview
-    = f.submit t('.save')
+    = f.button formaction: :preview do
+      %em.fa.fa-eye
+      =t '.visualise'
+    = f.button do
+      %em.fa.fa-check
+      =t '.save'