Avis sign up should use generic layout

app/assets/stylesheets/new_design/avis_sign_up.scss

@@ -2,14 +2,6 @@
 @import "colors";
 
 .avis-sign-up {
-  display: flex;
-
-  .left,
-  .right {
-    width: 50%;
-    padding: 60px 86px;
-  }
-
   .left {
     p {
       margin: auto;
@@ -28,12 +20,4 @@
       margin-top: 15px;
     }
   }
-
-  .right {
-    background-color: $light-grey;
-
-    form {
-      max-width: 420px;
-    }
-  }
 }

app/assets/stylesheets/new_design/login.scss

@@ -16,7 +16,7 @@ $login-breakpoint: 820px;
 }
 
 @media (max-width: $login-breakpoint) {
-  .two-columns {
+  .two-columns.login {
     background: #FFFFFF;
   }
 }

app/views/backoffice/avis/sign_up.html.haml

@@ -1,15 +1,16 @@
-.avis-sign-up
-  .left
-    %p.description= @dossier.procedure.libelle
-    %p.dossier Dossier nº #{@dossier.id}
-  .right
-    = form_for(Gestionnaire.new, url: { controller: "backoffice/avis", action: :create_gestionnaire }, method: :post, html: { class: "form" }) do |f|
-      %h1 Créez-vous un compte
+.two-columns.avis-sign-up
+  .columns-container
+    .column.left
+      %p.description= @dossier.procedure.libelle
+      %p.dossier Dossier nº #{@dossier.id}
+    .column
+      = form_for(Gestionnaire.new, url: { controller: "backoffice/avis", action: :create_gestionnaire }, method: :post, html: { class: "form" }) do |f|
+        %h1 Créez-vous un compte
 
-      = f.label :email, "Email"
-      = f.email_field :email, value: @email, disabled: true
+        = f.label :email, "Email"
+        = f.email_field :email, value: @email, disabled: true
 
-      = f.label :password, "Mot de passe"
-      = f.password_field :password, autofocus: true, required: true, placeholder: "8 caractères minimum"
+        = f.label :password, "Mot de passe"
+        = f.password_field :password, autofocus: true, required: true, placeholder: "8 caractères minimum"
 
-      = f.submit "Créer un compte", class: "button large primary expand"
+        = f.submit "Créer un compte", class: "button large primary expand"

app/views/users/sessions/new.html.haml

@@ -1,4 +1,4 @@
-.two-columns
+.two-columns.login
   .columns-container
     .column.preview
       - unless @dossier