diff --git a/app.rb b/app.rb
index 3e291364..9471c646 100644
--- a/app.rb
+++ b/app.rb
@@ -100,6 +100,9 @@ def self.development? = ENV['RACK_ENV'] == 'development'
             config[:strategy] ||= Html2rss::RequestService.default_strategy_name
           end
 
+          # Merge global stylesheets into the config
+          config = LocalConfig.merge_global_stylesheets(config)
+
           feed = Html2rss.feed(config)
 
           HttpCache.expires(response, feed.channel.ttl.to_i * 60, cache_control: 'public')
diff --git a/app/local_config.rb b/app/local_config.rb
index e1b8f3e4..74347d62 100644
--- a/app/local_config.rb
+++ b/app/local_config.rb
@@ -19,7 +19,22 @@ class NotFound < RuntimeError; end
       # @param name [String, Symbol, #to_sym]
       # @return [Hash<Symbol, Any>]
       def find(name)
-        feeds.fetch(name.to_sym) { raise NotFound, "Did not find local feed config at '#{name}'" }
+        feed_config = feeds.fetch(name.to_sym) { raise NotFound, "Did not find local feed config at '#{name}'" }
+        merge_global_stylesheets(feed_config)
+      end
+
+      ##
+      # Merges global stylesheets into a feed configuration if the feed doesn't already have stylesheets.
+      #
+      # @param config [Hash] The feed configuration to merge stylesheets into
+      # @return [Hash] The configuration with merged stylesheets (duplicated if needed)
+      def merge_global_stylesheets(config)
+        global_config = global
+        return config unless global_config[:stylesheets] && !config.key?(:stylesheets)
+
+        config = config.dup
+        config[:stylesheets] = global_config[:stylesheets]
+        config
       end
 
       ##
diff --git a/spec/html2rss/web/app/local_config_spec.rb b/spec/html2rss/web/app/local_config_spec.rb
index ab9e42c8..511bd290 100644
--- a/spec/html2rss/web/app/local_config_spec.rb
+++ b/spec/html2rss/web/app/local_config_spec.rb
@@ -31,4 +31,140 @@
   describe '.global' do
     it { expect(described_class.global).to be_a Hash }
   end
+
+  describe '.merge_global_stylesheets' do
+    let(:config_with_stylesheets) do
+      {
+        stylesheets: [{ href: '/custom.xsl', type: 'text/xsl' }],
+        feeds: {
+          example: {
+            channel: { url: 'https://example.com' },
+            selectors: { items: { selector: 'div' } }
+          }
+        }
+      }
+    end
+
+    let(:config_without_stylesheets) do
+      {
+        stylesheets: [{ href: '/rss.xsl', type: 'text/xsl' }],
+        feeds: {
+          example: {
+            channel: { url: 'https://example.com' },
+            selectors: { items: { selector: 'div' } }
+          }
+        }
+      }
+    end
+
+    let(:config_no_global_stylesheets) do
+      {
+        feeds: {
+          example: {
+            channel: { url: 'https://example.com' },
+            selectors: { items: { selector: 'div' } }
+          }
+        }
+      }
+    end
+
+    context 'when config has no stylesheets and global has stylesheets' do
+      before do
+        allow(described_class).to receive(:global).and_return(config_without_stylesheets)
+      end
+
+      it 'merges global stylesheets into the config' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result[:stylesheets]).to eq([{ href: '/rss.xsl', type: 'text/xsl' }])
+      end
+
+      it 'preserves original config data' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result[:channel]).to eq({ url: 'https://test.com' })
+      end
+
+      it 'duplicates the config to avoid mutation' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result).not_to be(config)
+      end
+
+      it 'creates a new object instance' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result.object_id).not_to eq(config.object_id)
+      end
+    end
+
+    context 'when config already has stylesheets' do
+      before do
+        allow(described_class).to receive(:global).and_return(config_without_stylesheets)
+      end
+
+      it 'does not override existing stylesheets' do
+        config = { stylesheets: [{ href: '/custom.xsl', type: 'text/xsl' }] }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result[:stylesheets]).to eq([{ href: '/custom.xsl', type: 'text/xsl' }])
+      end
+
+      it 'returns the original config without duplication' do
+        config = { stylesheets: [{ href: '/custom.xsl', type: 'text/xsl' }] }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result).to be(config)
+      end
+    end
+
+    context 'when global config has no stylesheets' do
+      before do
+        allow(described_class).to receive(:global).and_return(config_no_global_stylesheets)
+      end
+
+      it 'returns the original config unchanged' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result).to be(config)
+      end
+
+      it 'does not add stylesheets when none exist globally' do
+        config = { channel: { url: 'https://test.com' } }
+        result = described_class.merge_global_stylesheets(config)
+
+        expect(result[:stylesheets]).to be_nil
+      end
+    end
+  end
+
+  describe '.find with stylesheet merging' do
+    before do
+      allow(described_class).to receive_messages(feeds: {
+                                                   example: {
+                                                     channel: { url: 'https://example.com' },
+                                                     selectors: { items: { selector: 'div' } }
+                                                   }
+                                                 }, global: {
+                                                   stylesheets: [{ href: '/rss.xsl', type: 'text/xsl' }]
+                                                 })
+    end
+
+    it 'merges global stylesheets when finding a feed' do
+      result = described_class.find('example')
+
+      expect(result[:stylesheets]).to eq([{ href: '/rss.xsl', type: 'text/xsl' }])
+    end
+
+    it 'preserves feed configuration when finding a feed' do
+      result = described_class.find('example')
+
+      expect(result[:channel]).to eq({ url: 'https://example.com' })
+    end
+  end
 end