diff --git a/app/controllers/mentor/courses_controller.rb b/app/controllers/mentor/courses_controller.rb
index 1695bc85d08..11ac2af7ffd 100644
--- a/app/controllers/mentor/courses_controller.rb
+++ b/app/controllers/mentor/courses_controller.rb
@@ -8,7 +8,12 @@ def index
   end
 
   def new
-    @course = Course.new
+    if params[:course_id].present?
+      original_course = Course.find(params[:course_id])
+      @course = Course.new(category_ids: original_course.category_ids)
+    else
+      @course = Course.new
+    end
   end
 
   def edit; end
diff --git a/app/javascript/stylesheets/shared/blocks/card/_card-footer.sass b/app/javascript/stylesheets/shared/blocks/card/_card-footer.sass
index 17fe24beac9..ddf6527adf9 100644
--- a/app/javascript/stylesheets/shared/blocks/card/_card-footer.sass
+++ b/app/javascript/stylesheets/shared/blocks/card/_card-footer.sass
@@ -1,6 +1,7 @@
 .card-footer
+  container: card-footer / inline-size
   +media-breakpoint-up(md)
-    padding: .5rem 1.25rem
+    padding: .5rem 1rem
     min-height: 3rem
   +media-breakpoint-down(sm)
     padding: .5rem .75rem
diff --git a/app/javascript/stylesheets/shared/blocks/card/_card-main-actions.sass b/app/javascript/stylesheets/shared/blocks/card/_card-main-actions.sass
index 1f87c7b7c4b..af6576a3376 100644
--- a/app/javascript/stylesheets/shared/blocks/card/_card-main-actions.sass
+++ b/app/javascript/stylesheets/shared/blocks/card/_card-main-actions.sass
@@ -5,29 +5,29 @@
 .card-main-actions__items
   display: flex
   gap: .75rem
-  +media-breakpoint-up(md)
+  @container card-footer (min-width: 20em)
     +position(relative)
     justify-content: center
     flex-wrap: wrap
     align-items: flex-end
     min-height: 1.875rem
-  +media-breakpoint-down(sm)
+  @container card-footer (max-width: 19.9375em)
     flex-direction: column
   &.is-sub-actions
     justify-content: flex-end
-    +media-breakpoint-down(sm)
+    @container card-footer (max-width: 19.9375em)
       flex-direction: row
     .card-main-actions__item.is-sub
       position: static
       flex: 0 0 auto
 
 .card-main-actions__item
-  +media-breakpoint-up(md)
-    flex: 0 0 12rem
-    max-width: calc(50% - .375rem)
+  @container card-footer (min-width: 20em)
+    flex: 1
+    max-width: 15rem
     &.is-sub
       +position(absolute, right 0, bottom 0)
-  +media-breakpoint-down(sm)
+  @container card-footer (max-width: 19.9375em)
     flex-basis: 100%
     max-width: 100%
     &.is-sub
@@ -37,6 +37,10 @@
   &.is-end
     margin-left: auto
     flex-basis: 2.5rem
+  .card-main-actions.is-3-items &
+    @container card-footer (min-width: 20em)
+      flex: 1 0 0
+
 
 .card-main-actions__muted-action
   +hover-link-reversal
diff --git a/app/views/courses/_course.html.slim b/app/views/courses/_course.html.slim
index 4770b7caf46..59a7e18789f 100644
--- a/app/views/courses/_course.html.slim
+++ b/app/views/courses/_course.html.slim
@@ -14,7 +14,7 @@
       - if mentor_login?
         hr.a-border-tint
         footer.card-footer
-          .card-main-actions
+          .card-main-actions.is-3-items
             ul.card-main-actions__items
               li.card-main-actions__item
                 = link_to edit_mentor_course_path(course), class: 'a-button is-sm is-secondary is-block' do
@@ -24,3 +24,7 @@
                 = link_to mentor_course_categories_path(course), class: 'a-button is-sm is-secondary is-block' do
                   i.fa-solid.fa-align-justify
                   | 並び替え
+              li.card-main-actions__item
+                = link_to new_mentor_course_path(course_id: course.id), class: 'a-button is-sm is-secondary is-block' do
+                  i.fa-solid.fa-copy
+                  | コピー
diff --git a/app/views/mentor/courses/categories/index.html.slim b/app/views/mentor/courses/categories/index.html.slim
index 4aafd8678d8..4318313b538 100644
--- a/app/views/mentor/courses/categories/index.html.slim
+++ b/app/views/mentor/courses/categories/index.html.slim
@@ -23,7 +23,7 @@ header.page-header
                   | コース一覧
   hr.a-border
   .page-body
-    .container.is-lg
+    .container.is-md
       .admin-table.is-grab
         table.admin-table__table
           thead.admin-table__header