diff --git a/app/views/build_stats/index.haml b/app/views/build_stats/index.haml
index 27dc20d1..20c9c97e 100644
--- a/app/views/build_stats/index.haml
+++ b/app/views/build_stats/index.haml
@@ -1,5 +1,5 @@
 %main.row
-  %aside.menu.col-md-3
+  %aside.menu.col-12.col-lg-3
     %h1= @site.title
     %p.lead= @site.description
   .col
diff --git a/app/views/collaborations/collaborate.haml b/app/views/collaborations/collaborate.haml
index 4d43ad7e..9daad84d 100644
--- a/app/views/collaborations/collaborate.haml
+++ b/app/views/collaborations/collaborate.haml
@@ -1,10 +1,10 @@
 .row.align-items-center.justify-content-center.full-height
-  .col-md-10.align-self-center
+  .col-12.col-lg-10.align-self-center
     - welcome = @site.config.dig('welcome', 'message') || t('.welcome',
       site: @site.hostname)
     = sanitize_markdown welcome
 
-  .col-md-6.align-self-center
+  .col-12.col-lg-6.align-self-center
     -# Copiado y pegado de app/views/devise/registrations/new.haml
     - resource = resource_name = @invitade
     = form_for(resource, as: resource_name,
diff --git a/app/views/devise/confirmations/new.haml b/app/views/devise/confirmations/new.haml
index bc2f77bb..9e17fe0e 100644
--- a/app/views/devise/confirmations/new.haml
+++ b/app/views/devise/confirmations/new.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-4.align-self-center
+  .col-12.col-lg-5.align-self-center
     .sr-only
       %h2= t('.resend_confirmation_instructions')
 
diff --git a/app/views/devise/invitations/edit.haml b/app/views/devise/invitations/edit.haml
index ed4980ef..94050214 100644
--- a/app/views/devise/invitations/edit.haml
+++ b/app/views/devise/invitations/edit.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     %h2= t 'devise.invitations.edit.header'
     = form_for(resource,
       as: resource_name,
diff --git a/app/views/devise/invitations/new.haml b/app/views/devise/invitations/new.haml
index 4ebb8fa7..b6e6f4c4 100644
--- a/app/views/devise/invitations/new.haml
+++ b/app/views/devise/invitations/new.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     %h2= t 'devise.invitations.new.header'
     = form_for(resource,
       as: resource_name,
diff --git a/app/views/devise/passwords/edit.haml b/app/views/devise/passwords/edit.haml
index 3a8843c0..597bdde1 100644
--- a/app/views/devise/passwords/edit.haml
+++ b/app/views/devise/passwords/edit.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     .sr-only
       %h2= t('.change_your_password')
       %p= t('.help')
diff --git a/app/views/devise/passwords/new.haml b/app/views/devise/passwords/new.haml
index 08dd8d2e..de422f57 100644
--- a/app/views/devise/passwords/new.haml
+++ b/app/views/devise/passwords/new.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     .sr-only
       %h2= t('.forgot_your_password')
       %p= t('.help')
diff --git a/app/views/devise/registrations/edit.haml b/app/views/devise/registrations/edit.haml
index 92699ab8..f87921a7 100644
--- a/app/views/devise/registrations/edit.haml
+++ b/app/views/devise/registrations/edit.haml
@@ -6,7 +6,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-6.align-self-center
+  .col-12.col-lg-6.align-self-center
     %h2= t('.title')
     = form_for(resource,
       as: resource_name,
diff --git a/app/views/devise/registrations/new.haml b/app/views/devise/registrations/new.haml
index 26fc8e18..3fb22ca6 100644
--- a/app/views/devise/registrations/new.haml
+++ b/app/views/devise/registrations/new.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-6.align-self-center
+  .col-12.col-lg-6.align-self-center
     %h2= t('.sign_up')
     %p= t('.help')
 
diff --git a/app/views/devise/sessions/new.haml b/app/views/devise/sessions/new.haml
index c35f04db..9d6c7a02 100644
--- a/app/views/devise/sessions/new.haml
+++ b/app/views/devise/sessions/new.haml
@@ -2,7 +2,7 @@
   - 'black-bg'
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     .sr-only
       %h2= t('.sign_in')
       %p= t('.help')
diff --git a/app/views/devise/unlocks/new.haml b/app/views/devise/unlocks/new.haml
index 09468a52..4d9001ca 100644
--- a/app/views/devise/unlocks/new.haml
+++ b/app/views/devise/unlocks/new.haml
@@ -4,7 +4,7 @@
 = render 'devise/shared/error_messages', resource: resource
 
 .row.align-items-center.justify-content-center.full-height
-  .col-md-5.align-self-center
+  .col-12.col-lg-5.align-self-center
     .sr-only
       %h2= t('.resend_unlock_instructions')
       %p= t('.help')
diff --git a/app/views/posts/edit.haml b/app/views/posts/edit.haml
index 6ec252fe..d03e08c7 100644
--- a/app/views/posts/edit.haml
+++ b/app/views/posts/edit.haml
@@ -1,3 +1,3 @@
 .row.justify-content-center
-  .col-md-8
+  .col-12.col-lg-8
     = render 'posts/form', site: @site, post: @post
diff --git a/app/views/posts/index.haml b/app/views/posts/index.haml
index aad4be9e..db69871b 100644
--- a/app/views/posts/index.haml
+++ b/app/views/posts/index.haml
@@ -1,5 +1,5 @@
 %main.row
-  %aside.menu.col-md-3
+  %aside.menu.col-lg-3
     .hyphens{ lang: @site.default_locale }
       %h1= @site.title
       %p.lead= @site.description
diff --git a/app/views/posts/new.haml b/app/views/posts/new.haml
index 6ec252fe..d03e08c7 100644
--- a/app/views/posts/new.haml
+++ b/app/views/posts/new.haml
@@ -1,3 +1,3 @@
 .row.justify-content-center
-  .col-md-8
+  .col-12.col-lg-8
     = render 'posts/form', site: @site, post: @post
diff --git a/app/views/posts/show.haml b/app/views/posts/show.haml
index 068a6adf..8b68c62a 100644
--- a/app/views/posts/show.haml
+++ b/app/views/posts/show.haml
@@ -1,6 +1,6 @@
 - dir = @site.data.dig(params[:locale], 'dir')
 .row.justify-content-center
-  .col-md-8
+  .col-12.col-lg-8
     %article.content.table-responsive-md
       = link_to t('posts.edit'),
         edit_site_post_path(@site, @post.id),
diff --git a/app/views/sites/edit.haml b/app/views/sites/edit.haml
index 4ae7308d..2013c6f6 100644
--- a/app/views/sites/edit.haml
+++ b/app/views/sites/edit.haml
@@ -1,5 +1,5 @@
 .row.justify-content-center
-  .col-md-8
+  .col-12.col-lg-8
     %h1= t('.title', site: @site.name)
 
     = render 'form', site: @site, submit: t('.submit')
diff --git a/app/views/sites/fetch.haml b/app/views/sites/fetch.haml
index f5d049c8..51e0aa74 100644
--- a/app/views/sites/fetch.haml
+++ b/app/views/sites/fetch.haml
@@ -1,5 +1,5 @@
 .row.justify-content-center
-  .col-md-8#pull
+  .col-12.col-lg-8#pull
     %h1= t('.title')
     %p.lead= sanitize_markdown t('.help.fetch'), tags: %w[em strong a]
 
@@ -10,7 +10,7 @@
 
 - @commits.each do |commit|
   .row.justify-content-center
-    .col-md-8{ id: commit.oid }
+    .col-12.col-lg-8{ id: commit.oid }
       %h1= commit.summary
       %p.lead= render 'layouts/time', time: commit.time
 
@@ -25,6 +25,6 @@
 
 - unless @commits.empty?
   .row.justify-content-center
-    .col-md-8
+    .col-12.col-lg-8
       = link_to t('.merge.request'), site_pull_path(@site),
         method: 'post', class: 'btn btn-lg'
diff --git a/app/views/sites/index.haml b/app/views/sites/index.haml
index b7231292..dfd33c6c 100644
--- a/app/views/sites/index.haml
+++ b/app/views/sites/index.haml
@@ -1,5 +1,5 @@
 %main.row
-  %aside.col-md-3
+  %aside.col-12.col-lg-3
     %h1= t('.title')
     %p.lead= t('.help')
     - if policy(Site).new?
diff --git a/app/views/sites/new.haml b/app/views/sites/new.haml
index 68c17882..23ee8b40 100644
--- a/app/views/sites/new.haml
+++ b/app/views/sites/new.haml
@@ -1,5 +1,5 @@
 .row.justify-content-center
-  .col-md-8
+  .col-12.col-lg-8
     %h1= t('.title')
     %p.lead= t('.help')
 
diff --git a/app/views/stats/index.haml b/app/views/stats/index.haml
index 88e86aa3..d3a11ffe 100644
--- a/app/views/stats/index.haml
+++ b/app/views/stats/index.haml
@@ -38,7 +38,7 @@
       - if @normalized_urls.present?
         = line_chart site_stats_uris_path(urls: @normalized_urls, **@chart_params), **@chart_options
 
-    .row.mb-5.row-cols-1.row-cols-md-2
+    .row.mb-5.row-cols-1.row-cols-lg-2
       - @columns.each_pair do |column, values|
         - next if values.blank?
         .col.mb-5
diff --git a/app/views/usuaries/index.haml b/app/views/usuaries/index.haml
index 124fb04b..edb9ad19 100644
--- a/app/views/usuaries/index.haml
+++ b/app/views/usuaries/index.haml
@@ -1,5 +1,5 @@
 .row.justify-content-center
-  .col.col-md-8
+  .col.col-lg-8
     %h1= t('.title')
 
     -# Una tabla de usuaries y otra de invitades, con acciones
diff --git a/app/views/usuaries/invite.haml b/app/views/usuaries/invite.haml
index 26eb5039..4f4412ad 100644
--- a/app/views/usuaries/invite.haml
+++ b/app/views/usuaries/invite.haml
@@ -1,7 +1,7 @@
 - invite_as = t("usuaries.invite_as.#{params[:invite_as]}")
 
 .row.justify-content-center
-  .col.col-md-8
+  .col.col-lg-8
     %h1= t('.title', invite_as: invite_as)
 
     = form_with url: site_usuaries_invite_path(@site), local: true do |f|