diff --git a/assets/css/_page/_single/_code.scss b/assets/css/_page/_single/_code.scss
index 29fcb6c0..678cab08 100644
--- a/assets/css/_page/_single/_code.scss
+++ b/assets/css/_page/_single/_code.scss
@@ -132,6 +132,10 @@ pre {
 
   // code fences blocks wrapped
   &.code-block {
+    &.instant-height .code-wrapper {
+      transition: height 0s !important;
+    }
+
     .code-wrapper {
       overflow: hidden;
       height: auto;
@@ -173,6 +177,7 @@ pre {
       position: sticky;
       top: fixit-var(breadcrumb-height);
       transition: border-radius 0s;
+      cursor: pointer;
       @include z-index(base);
       @include border-radius(top);
 
@@ -184,10 +189,6 @@ pre {
         }
       }
 
-      &:hover {
-        cursor: pointer;
-      }
-
       .code-title {
         width: 100%;
         padding: 0.4rem;
@@ -243,6 +244,12 @@ pre {
         color: fixit-var(global-link-hover-color);
       }
 
+      .fullscreen-btn[data-fullscreen] .fa-expand {
+        --fa: "\f066";
+        font-weight: 900;
+        color: fixit-var(global-link-hover-color);
+      }
+
       @each $type, $text in $code-type-map {
         &.language-#{to-lower-case($type)} {
           // e.g., --fi-code-type: "JavaScript";
@@ -258,6 +265,38 @@ pre {
       color: fixit-var(global-link-hover-color);
     }
 
+    &.is-fullscreen {
+      position: fixed;
+      top: 0;
+      right: 0;
+      bottom: 0;
+      left: 0;
+      margin: 0 !important;
+      overflow: auto;
+      @include z-index(fixed, 1);
+      @include border-radius(0);
+
+      .code-header {
+        top: 0 !important;
+        cursor: default;
+        @include border-radius(0);
+
+        .arrow {
+          display: none;
+        }
+      }
+
+      .code-wrapper {
+        overflow: auto;
+        // 1.4em for header height, 0.8rem for padding
+        height: calc(100dvh - 1.4em - 0.8rem);
+      }
+
+      .code-expand-btn {
+        display: none;
+      }
+    }
+
     .code-expand-btn {
       width: 100%;
       padding-block: 1rem;
diff --git a/assets/js/theme.js b/assets/js/theme.js
index 68667aaa..76f6b1f1 100644
--- a/assets/js/theme.js
+++ b/assets/js/theme.js
@@ -486,6 +486,58 @@ class FixIt {
     }, false);
   }
 
+  _setCodeFullscreenState(codeBlock, show) {
+    const fullscreenBtn = codeBlock.querySelector('.code-header .fullscreen-btn');
+    const hasExpandBtn = !!codeBlock.querySelector('.code-expand-btn');
+    if (show && hasExpandBtn) {
+      codeBlock.dataset.fullscreenExpanded = codeBlock.classList.contains('is-expanded') ? 'true' : 'false';
+      codeBlock.classList.add('is-expanded');
+    }
+    if (!show && codeBlock.classList.contains('is-fullscreen')) {
+      codeBlock.classList.add('instant-height');
+      if (hasExpandBtn && codeBlock.dataset.fullscreenExpanded === 'false') {
+        codeBlock.classList.remove('is-expanded');
+      }
+      delete codeBlock.dataset.fullscreenExpanded;
+      window.requestAnimationFrame(() => {
+        codeBlock.classList.remove('instant-height');
+      });
+    }
+    codeBlock.classList.toggle('is-fullscreen', show);
+    fullscreenBtn?.toggleAttribute('data-fullscreen', show);
+    const hasFullscreenCode = !!document.querySelector('.code-block.highlight.is-fullscreen');
+    document.documentElement.style.overflow = hasFullscreenCode ? 'hidden' : '';
+  }
+
+  closeCodeFullscreen() {
+    const $activeCodeBlock = document.querySelector('.code-block.highlight.is-fullscreen');
+    if (!$activeCodeBlock) return;
+    this._setCodeFullscreenState($activeCodeBlock, false);
+  }
+
+  initFullscreenCode(codeBlock) {
+    const fullscreenBtn = codeBlock.querySelector('.code-header .fullscreen-btn');
+    if (!fullscreenBtn) return;
+    fullscreenBtn.addEventListener('click', () => {
+      const isFullscreen = codeBlock.classList.contains('is-fullscreen');
+      if (isFullscreen) {
+        this._setCodeFullscreenState(codeBlock, false);
+        return;
+      }
+      this.closeCodeFullscreen();
+      codeBlock.classList.remove('is-collapsed');
+      this._setCodeFullscreenState(codeBlock, true);
+    }, false);
+    if (!this._codeFullscreenOnEsc) {
+      this._codeFullscreenOnEsc = (event) => {
+        if (event.key === 'Escape') {
+          this.closeCodeFullscreen();
+        }
+      };
+      document.addEventListener('keydown', this._codeFullscreenOnEsc, false);
+    }
+  }
+
   /**
    * init code wrapper
    */
@@ -505,8 +557,10 @@ class FixIt {
         const $codeHeader = $codeBlock.querySelector('.code-header');
         if (!$codeHeader) return;
         this.initDownloadCode($codeBlock, $codePreEl);
+        this.initFullscreenCode($codeBlock);
         // code title
         $codeHeader.querySelector('.code-title').addEventListener('click', () => {
+          if ($codeBlock.classList.contains('is-fullscreen')) return;
           $codeBlock.classList.toggle('is-collapsed');
         }, false);
         // ellipses icon
diff --git a/hugo.toml b/hugo.toml
index 9748f7a1..b64bb0a7 100644
--- a/hugo.toml
+++ b/hugo.toml
@@ -1146,6 +1146,8 @@ maxShownLines = 10
 copyable = true
 # [classic] whether to enable code download button in the code block header
 downloadable = false
+# [classic] whether to enable code fullscreen button in the code block header
+fullscreen = false
 # [classic] whether to enable line numbers toggle button in the code block header
 lineNosToggler = true
 # [classic] whether to enable toggle line wrapping button in the code block header
diff --git a/i18n/de.toml b/i18n/de.toml
index f4a62e62..d217ae22 100644
--- a/i18n/de.toml
+++ b/i18n/de.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Zeilennummern umschalten"
 toggleLineWrap = "Zeilenumbruch umschalten"
 toggleCodeEditable = "Codeblock editierbar umschalten"
 downloadCode = "Code herunterladen"
+toggleCodeFullscreen = "Codeblock-Vollbild umschalten"
 expandCode = "Codeblock erweitern oder reduzieren"
 cookieconsentMessage = "Diese Website verwendet Cookies, um Ihre Erfahrung zu verbessern."
 cookieconsentDismiss = "Zustimmen"
diff --git a/i18n/en.toml b/i18n/en.toml
index 3f4aea87..c60d6d7f 100644
--- a/i18n/en.toml
+++ b/i18n/en.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Toggle line numbers"
 toggleLineWrap = "Toggle code wrap"
 toggleCodeEditable = "Toggle code block editable"
 downloadCode = "Download code"
+toggleCodeFullscreen = "Toggle code block fullscreen"
 expandCode = "Expand or collapse code block"
 cookieconsentMessage = "This website uses Cookies to improve your experience."
 cookieconsentDismiss = "Got it!"
diff --git a/i18n/es.toml b/i18n/es.toml
index a71807db..cb7c4703 100644
--- a/i18n/es.toml
+++ b/i18n/es.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Alternar números de línea"
 toggleLineWrap = "Alternar ajuste de línea"
 toggleCodeEditable = "Alternar bloque de código editable"
 downloadCode = "Descargar código"
+toggleCodeFullscreen = "Alternar pantalla completa del bloque de código"
 expandCode = "Expandir o contraer bloque de código"
 cookieconsentMessage = "Este sitio web utiliza Cookies para mejorar su experiencia."
 cookieconsentDismiss = "De acuerdo"
diff --git a/i18n/fr.toml b/i18n/fr.toml
index 24cd209e..d3bdba94 100644
--- a/i18n/fr.toml
+++ b/i18n/fr.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Basculer les numéros de ligne"
 toggleLineWrap = "Basculer le retour à la ligne"
 toggleCodeEditable = "Basculer le bloc de code modifiable"
 downloadCode = "Télécharger le code"
+toggleCodeFullscreen = "Basculer le plein écran du bloc de code"
 expandCode = "Développer ou réduire le bloc de code"
 cookieconsentMessage = "Ce site Web utilise des Cookies pour améliorer votre expérience."
 cookieconsentDismiss = "J'ai compris !"
diff --git a/i18n/hi.toml b/i18n/hi.toml
index 25f6046a..b80c991a 100644
--- a/i18n/hi.toml
+++ b/i18n/hi.toml
@@ -104,6 +104,7 @@ toggleLineNumbers = "लाइन नंबर टॉगल करें"
 toggleLineWrap = "लाइन रैप टॉगल करें"
 toggleCodeEditable = "कोड ब्लॉक संपादन योग्य टॉगल करें"
 downloadCode = "कोड डाउनलोड करें"
+toggleCodeFullscreen = "कोड ब्लॉक फ़ुलस्क्रीन टॉगल करें"
 expandCode = "कोड ब्लॉक का विस्तार या संकुचित करें"
 cookieconsentMessage = "यह वेबसाइट आपके अनुभव को बेहतर बनाने के लिए कुकीज़ का उपयोग करती है।"
 cookieconsentDismiss = "समझ गया!"
diff --git a/i18n/it.toml b/i18n/it.toml
index 5b5e3874..9dff9e15 100644
--- a/i18n/it.toml
+++ b/i18n/it.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Attiva/disattiva i numeri di linea"
 toggleLineWrap = "Attiva/disattiva il ritorno a capo del codice"
 toggleCodeEditable = "Attiva/disattiva la modifica del blocco di codice"
 downloadCode = "Scarica codice"
+toggleCodeFullscreen = "Attiva/disattiva schermo intero del blocco di codice"
 expandCode = "Espandi o riduci il blocco di codice"
 cookieconsentMessage = "Questo sito Web utilizza i Cookies per migliorare la tua esperienza."
 cookieconsentDismiss = "Essere d'accordo"
diff --git a/i18n/ja.toml b/i18n/ja.toml
index 2c2cd76b..d4c81f98 100644
--- a/i18n/ja.toml
+++ b/i18n/ja.toml
@@ -101,6 +101,7 @@ toggleLineNumbers = "行番号の切り替え"
 toggleLineWrap = "自動折り返しの切り替え"
 toggleCodeEditable = "コードブロックの編集切り替え"
 downloadCode = "コードをダウンロード"
+toggleCodeFullscreen = "コードブロックの全画面表示を切り替え"
 expandCode = "コードブロックの展開/折りたたみ"
 cookieconsentMessage = "このウェブサイトはクッキーを使用して体験を向上させます。"
 cookieconsentDismiss = "同意する"
diff --git a/i18n/ko.toml b/i18n/ko.toml
index 47c3228d..50973efb 100644
--- a/i18n/ko.toml
+++ b/i18n/ko.toml
@@ -101,6 +101,7 @@ toggleLineNumbers = "줄 번호 전환"
 toggleLineWrap = "자동 줄 바꿈 전환"
 toggleCodeEditable = "코드 블록 편집 전환"
 downloadCode = "코드 다운로드"
+toggleCodeFullscreen = "코드 블록 전체 화면 전환"
 expandCode = "코드 블록 확장/축소"
 cookieconsentMessage = "이 웹사이트는 쿠키를 사용하여 경험을 향상시킵니다."
 cookieconsentDismiss = "동의"
diff --git a/i18n/pl.toml b/i18n/pl.toml
index 39e80653..67050e97 100644
--- a/i18n/pl.toml
+++ b/i18n/pl.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Przełącz numery linii"
 toggleLineWrap = "Przełącz zawijanie linii"
 toggleCodeEditable = "Przełącz edytowalny blok kodu"
 downloadCode = "Pobierz kod"
+toggleCodeFullscreen = "Przełącz pełny ekran bloku kodu"
 expandCode = "Rozwiń lub zwiń blok kodu"
 cookieconsentMessage = "Ta strona korzysta z plików Cookies, aby poprawić komfort użytkowania."
 cookieconsentDismiss = "Zgodzić się"
diff --git a/i18n/pt-BR.toml b/i18n/pt-BR.toml
index 661d5bbb..69d88749 100644
--- a/i18n/pt-BR.toml
+++ b/i18n/pt-BR.toml
@@ -104,6 +104,7 @@ toggleLineNumbers = "Alternar números de linha"
 toggleLineWrap = "Alternar quebra de linha"
 toggleCodeEditable = "Alternar bloco de código editável"
 downloadCode = "Baixar código"
+toggleCodeFullscreen = "Alternar tela cheia do bloco de código"
 expandCode = "Expandir ou recolher bloco de código"
 cookieconsentMessage = "Este site usa Cookies para melhorar sua experiência."
 cookieconsentDismiss = "Aceitar"
diff --git a/i18n/ro.toml b/i18n/ro.toml
index dfbee87e..e14accbb 100644
--- a/i18n/ro.toml
+++ b/i18n/ro.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Comută numerele de linie"
 toggleLineWrap = "Comută înfășurarea liniei"
 toggleCodeEditable = "Comută blocul de cod editabil"
 downloadCode = "Descarcă codul"
+toggleCodeFullscreen = "Comută ecran complet pentru blocul de cod"
 expandCode = "Extinde sau restrânge blocul de cod"
 cookieconsentMessage = "Acest site web utilizează Cookies pentru a vă îmbunătăți experiența."
 cookieconsentDismiss = "De acord"
diff --git a/i18n/ru.toml b/i18n/ru.toml
index bb72a719..221fda9e 100644
--- a/i18n/ru.toml
+++ b/i18n/ru.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Переключить номера строк"
 toggleLineWrap = "Переключить перенос строк"
 toggleCodeEditable = "Переключить редактируемый блок кода"
 downloadCode = "Скачать код"
+toggleCodeFullscreen = "Переключить полноэкранный режим блока кода"
 expandCode = "Развернуть или свернуть блок кода"
 cookieconsentMessage = "Этот сайт использует Cookies для улучшения вашего опыта."
 cookieconsentDismiss = "Согласен"
diff --git a/i18n/sr.toml b/i18n/sr.toml
index c2f20938..e4a65cb8 100644
--- a/i18n/sr.toml
+++ b/i18n/sr.toml
@@ -103,6 +103,7 @@ toggleLineNumbers = "Прекидач за бројеве линија"
 toggleLineWrap = "Прекидач за оматање линија"
 toggleCodeEditable = "Пребаци уређивање блока кода"
 downloadCode = "Преузми код"
+toggleCodeFullscreen = "Пребаци цео екран блока кода"
 expandCode = "Прошири или смањи блок кода"
 cookieconsentMessage = "Ова веб локација користи Cookies да би побољшала ваше искуство."
 cookieconsentDismiss = "Договорити се"
diff --git a/i18n/vi.toml b/i18n/vi.toml
index 06ecbf91..1e68c384 100644
--- a/i18n/vi.toml
+++ b/i18n/vi.toml
@@ -102,6 +102,7 @@ toggleLineNumbers = "Chuyển đổi số dòng"
 toggleLineWrap = "Chuyển đổi xuống dòng"
 toggleCodeEditable = "Chuyển đổi khối mã có thể chỉnh sửa"
 downloadCode = "Tải mã"
+toggleCodeFullscreen = "Chuyển đổi toàn màn hình khối mã"
 expandCode = "Mở rộng hoặc thu gọn khối mã"
 cookieconsentMessage = "Trang web này sử dụng Cookies để cải thiện trải nghiệm của bạn."
 cookieconsentDismiss = "Đã hiểu!"
diff --git a/i18n/zh-CN.toml b/i18n/zh-CN.toml
index 6d0c1ed4..c56c6aa1 100644
--- a/i18n/zh-CN.toml
+++ b/i18n/zh-CN.toml
@@ -101,6 +101,7 @@ toggleLineNumbers = "切换行号"
 toggleLineWrap = "切换自动换行"
 toggleCodeEditable = "切换可编辑代码块"
 downloadCode = "下载代码"
+toggleCodeFullscreen = "切换代码块全屏"
 expandCode = "展开或折叠代码块"
 cookieconsentMessage = "本网站使用 Cookies 来改善您的浏览体验。"
 cookieconsentDismiss = "同意"
diff --git a/i18n/zh-TW.toml b/i18n/zh-TW.toml
index 726378e3..d6400646 100644
--- a/i18n/zh-TW.toml
+++ b/i18n/zh-TW.toml
@@ -101,6 +101,7 @@ toggleLineNumbers = "切換行號"
 toggleLineWrap = "切換自動換行"
 toggleCodeEditable = "切換可編輯程式碼區塊"
 downloadCode = "下載程式碼"
+toggleCodeFullscreen = "切換程式碼區塊全螢幕"
 expandCode = "展開或摺疊程式碼區塊"
 cookieconsentMessage = "本網站使用 Cookies 來改善您的流覽體驗。"
 cookieconsentDismiss = "同意"
diff --git a/layouts/_partials/function/code-header.html b/layouts/_partials/function/code-header.html
index 14a33687..5f940bd9 100644
--- a/layouts/_partials/function/code-header.html
+++ b/layouts/_partials/function/code-header.html
@@ -8,6 +8,7 @@
 {{- $editBtn := "" -}}
 {{- $copyBtn := "" -}}
 {{- $downloadBtn := "" -}}
+{{- $fullscreenBtn := "" -}}
 {{- $foldIcon := dict "Class" "arrow fa-solid fa-chevron-down" | partial "plugin/icon.html" -}}
 {{- $titleEl := printf `<span class="code-title">%s</span>` $foldIcon -}}
 {{- $ellipsisBtn := printf `<span class="ellipses-btn" aria-label="Show more options" role="button">%s</span>` (dict "Class" "fa-solid fa-ellipsis-h" | partial "plugin/icon.html") -}}
@@ -35,10 +36,14 @@
   {{- $downloadIcon := dict "Class" "fa-solid fa-download" | partial "plugin/icon.html" -}}
   {{- $downloadBtn = printf `<span class="download-btn" aria-label="%s" role="button" title="%s">%s</span>` (T "assets.downloadCode") (T "assets.downloadCode") $downloadIcon -}}
 {{- end -}}
+{{- if $config.fullscreen -}}
+  {{- $fullscreenIcon := dict "Class" "fa-solid fa-expand" | partial "plugin/icon.html" -}}
+  {{- $fullscreenBtn = printf `<span class="fullscreen-btn" aria-label="%s" role="button" title="%s">%s</span>` (T "assets.toggleCodeFullscreen") (T "assets.toggleCodeFullscreen") $fullscreenIcon -}}
+{{- end -}}
 {{- with $config.name -}}
   {{- $titleEl = replace $titleEl `<span class="code-title">` (printf `<span class="code-title" data-name="%s">` .) -}}
 {{- end -}}
-{{- $codeHeader := printf `<div class="code-header language-%s">%s%s%s%s%s%s%s</div>` $lang $titleEl $ellipsisBtn $lineNosBtn $lineWrapBtn $editBtn $copyBtn $downloadBtn -}}
+{{- $codeHeader := printf `<div class="code-header language-%s">%s%s%s%s%s%s%s%s</div>` $lang $titleEl $ellipsisBtn $lineNosBtn $lineWrapBtn $editBtn $copyBtn $downloadBtn $fullscreenBtn -}}
 {{- $wrapper = replaceRE `(<div class="code-wrapper">)` (printf "%s$1" $codeHeader) $wrapper -}}
 
 {{- return $wrapper -}}
diff --git a/layouts/_partials/init/index.html b/layouts/_partials/init/index.html
index a39b9eca..b0a9db4d 100644
--- a/layouts/_partials/init/index.html
+++ b/layouts/_partials/init/index.html
@@ -1,4 +1,4 @@
-{{- hugo.Store.Set "version" "v0.4.3-20260302065610-78a994b9" -}}
+{{- hugo.Store.Set "version" "v0.4.3-20260303081459-41fe4197" -}}
 {{- .Store.Set "this" dict -}}
 
 {{- partial "init/detection-env.html" . -}}