diff --git a/app/javascript/styles/custom.scss b/app/javascript/styles/custom.scss
new file mode 100644
index 000000000..1f2be7bf5
--- /dev/null
+++ b/app/javascript/styles/custom.scss
@@ -0,0 +1,2 @@
+@import 'large_center';
+@import 'application';
diff --git a/app/javascript/styles/large_center.scss b/app/javascript/styles/large_center.scss
new file mode 100644
index 000000000..173dd80a1
--- /dev/null
+++ b/app/javascript/styles/large_center.scss
@@ -0,0 +1,31 @@
+.column {
+  width: 35em;
+}
+
+.drawer__inner__mastodon > img {
+  padding: 1rem;
+  box-sizing: border-box;
+}
+
+.compose-form__publish-button-wrapper .button {
+  background: #a1bded
+}
+
+div[aria-label="Accueil"],
+div[aria-label="Notifications"] {
+  width: 27em;
+}
+
+.media-gallery {
+  width: 115%;
+  max-height: 500px;
+}
+
+.media-gallery,
+.status-card.compact.interactive {
+  margin-left: -4.4em;
+}
+
+.status-card__image-image {
+  width: 100% !important;
+}
diff --git a/config/initializers/source.rb b/config/initializers/source.rb
new file mode 100644
index 000000000..96e0dcf9e
--- /dev/null
+++ b/config/initializers/source.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+module Mastodon
+  module Version
+    module_function
+    def source_base_url
+      'https://framagit.org/tykayn/mastodon'
+    end
+  end
+end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 091a4b72c..0ec39c18e 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -899,7 +899,7 @@ en:
     title: "%{instance} Terms of Service and Privacy Policy"
   themes:
     contrast: High contrast
-    default: Mastodon
+    default: Mastodon Bliss
     mastodon-light: Mastodon (light)
   time:
     formats:
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 96542347d..ce21e290e 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -887,7 +887,7 @@ fr:
     title: "%{instance} Conditions d’utilisation et politique de confidentialité"
   themes:
     contrast: Contraste élevé
-    default: Mastodon
+    default: Mastodon Bliss
     mastodon-light: Mastodon (clair)
   time:
     formats:
diff --git a/config/themes.yml b/config/themes.yml
index 9c21c9459..d032b009d 100644
--- a/config/themes.yml
+++ b/config/themes.yml
@@ -1,3 +1,3 @@
-default: styles/application.scss
+default: styles/custom.scss
 contrast: styles/contrast.scss
 mastodon-light: styles/mastodon-light.scss