diff --git a/assets/scss/partials/layout/archives.scss b/assets/scss/partials/layout/archives.scss
index 569348e..2ac3836 100644
--- a/assets/scss/partials/layout/archives.scss
+++ b/assets/scss/partials/layout/archives.scss
@@ -1,15 +1,5 @@
 .archives-group {
     margin-bottom: var(--section-separation);
-    .archives-date {
-        text-transform: uppercase;
-        margin-bottom: 10px;
-        font-size: 1.6rem;
-        font-weight: bold;
-
-        a {
-            color: var(--body-text-color);
-        }
-    }
 }
 
 .template-archives {
diff --git a/assets/scss/partials/layout/taxonomy.scss b/assets/scss/partials/layout/taxonomy.scss
index d594b23..4575a20 100644
--- a/assets/scss/partials/layout/taxonomy.scss
+++ b/assets/scss/partials/layout/taxonomy.scss
@@ -1,11 +1,3 @@
-.taxonomy-type {
-    text-transform: uppercase;
-    color: var(--body-text-color);
-    font-weight: bold;
-    margin-bottom: 5px;
-    font-size: 1.6rem;
-}
-
 .taxonomy-card {
     border-radius: var(--card-border-radius);
     background-color: var(--card-background);
diff --git a/assets/scss/partials/widgets.scss b/assets/scss/partials/widgets.scss
index 25661e7..33a02dd 100644
--- a/assets/scss/partials/widgets.scss
+++ b/assets/scss/partials/widgets.scss
@@ -1,13 +1,4 @@
 .widget {
-    .widget-title {
-        text-transform: uppercase;
-        color: var(--body-text-color);
-        font-weight: bold;
-        margin: 0;
-        margin-bottom: 10px;
-        font-size: 1.6rem;
-    }
-
     .widget-icon {
         svg {
             width: 32px;
@@ -45,27 +36,26 @@
 
 /* Archives widget */
 .widget.archives {
+    .widget-archive--list {
+        border-radius: var(--card-border-radius);
+        box-shadow: var(--shadow-l1);
+        background-color: var(--card-background);
+    }
+
     .archives-year {
-        margin-bottom: 10px;
+        &:not(:last-of-type) {
+            border-bottom: 1.5px solid var(--card-separator-color);
+        }
+
         a {
-            background-color: var(--card-background);
-            padding: 15px 25px;
-            border-radius: var(--card-border-radius);
-            box-shadow: var(--shadow-l1);
+            font-size: 1.4rem;
+            padding: 18px 25px;
             display: flex;
-            transition: box-shadow 0.3s ease;
-
-            &:hover {
-                box-shadow: var(--shadow-l2);
-            }
-
-            @media (max-width: $on-desktop-large) {
-                font-size: 1.4rem;
-            }
 
             span.year {
                 flex: 1;
                 color: var(--card-text-color-main);
+                font-weight: bold;
             }
 
             span.count {
diff --git a/assets/scss/style.scss b/assets/scss/style.scss
index dc7000d..bcbd41d 100644
--- a/assets/scss/style.scss
+++ b/assets/scss/style.scss
@@ -41,4 +41,18 @@ a {
             box-shadow: 0px -10px 0px rgba(var(--link-background-color), var(--link-background-opacity-hover)) inset;
         }
     }
-}
\ No newline at end of file
+}
+
+.section-title {
+    text-transform: uppercase;
+    margin-top: 0;
+    margin-bottom: 10px;
+    display: block;
+    font-size: 1.6rem;
+    font-weight: bold;
+    color: var(--body-text-color);
+
+    a {
+        color: var(--body-text-color);
+    }
+}
diff --git a/i18n/ja.toml b/i18n/ja.toml
new file mode 100644
index 0000000..0581364
--- /dev/null
+++ b/i18n/ja.toml
@@ -0,0 +1,23 @@
+[toggleMenu]
+    other = "メニューを開く・閉じる"
+    
+[relatedContents]
+    other = "関連するコンテンツ"
+
+[lastUpdatedOn]
+    other = "最終更新"
+
+[widgetArchivesTitle]
+    other = "アーカイブ"
+
+[widgetArchivesMore]
+    other = "さらに見る"
+
+[widgetTagCloudTitle]
+    other = "タグ"
+
+[notFoundTitle]
+    other = "404 Not Found"
+
+[notFoundSubtitle]
+    other = "指定されたページは存在しません。"
\ No newline at end of file
diff --git a/layouts/_default/archives.html b/layouts/_default/archives.html
index cf9ef94..0304832 100644
--- a/layouts/_default/archives.html
+++ b/layouts/_default/archives.html
@@ -2,14 +2,12 @@
 {{ define "main" }}
     {{ $categories := ($.Site.GetPage "taxonomyTerm" "categories").Pages }}
     {{ if $categories }}
-    <div class="widget">
-        <h1 class="widget-title">Categories</h1>
-        <div class="category-list">
-            <div class="article-list--tile">
-                {{ range $categories }}
-                    {{ partial "article-list/tile" (dict "context" . "size" "250x150" "Type" "taxonomy") }}
-                {{ end }}
-            </div>
+    <h2 class="section-title">Categories</h2>
+    <div class="category-list">
+        <div class="article-list--tile">
+            {{ range $categories }}
+                {{ partial "article-list/tile" (dict "context" . "size" "250x150" "Type" "taxonomy") }}
+            {{ end }}
         </div>
     </div>
     {{ end }}
@@ -21,7 +19,7 @@
     {{ range $filtered.GroupByDate "2006" }}
     {{ $id := lower (replace .Key " " "-") }}
     <div class="archives-group" id="{{ $id }}">
-        <h3 class="archives-date"><a href="{{ $.Permalink }}#{{ $id }}">{{ .Key }}</a></h3>
+        <h2 class="archives-date section-title"><a href="{{ $.Permalink }}#{{ $id }}">{{ .Key }}</a></h2>
         <div class="article-list--compact">
             {{ range .Pages }}
                 {{ partial "article-list/compact" . }}
diff --git a/layouts/_default/term.html b/layouts/_default/term.html
index 3189e9a..3bfcc28 100644
--- a/layouts/_default/term.html
+++ b/layouts/_default/term.html
@@ -1,5 +1,5 @@
 {{ define "main" }}
-    <h3 class="taxonomy-type">{{ .Type | singularize  | humanize }}</h3>
+    <h3 class="taxonomy-type section-title">{{ .Type | singularize | humanize }}</h3>
     <div class="taxonomy-card">
         <div class="taxonomy-details">
             <h3 class="taxonomy-count">{{ len .Pages }} post{{ if gt (len .Pages) 1 }}s{{ end }}</h3>
diff --git a/layouts/index.html b/layouts/index.html
index 1811bd2..b04b926 100644
--- a/layouts/index.html
+++ b/layouts/index.html
@@ -15,5 +15,5 @@
 {{ end }}
 
 {{ define "right-sidebar" }}
-    {{ partialCached "sidebar/right.html" . }}
+    {{ partial "sidebar/right.html" . }}
 {{ end }}
\ No newline at end of file
diff --git a/layouts/partials/article/components/related-contents.html b/layouts/partials/article/components/related-contents.html
index b06fce6..1265387 100644
--- a/layouts/partials/article/components/related-contents.html
+++ b/layouts/partials/article/components/related-contents.html
@@ -1,7 +1,7 @@
-<aside class="widget related-contents--wrapper">
+<aside class="related-contents--wrapper">
     {{ $related := .Site.RegularPages.Related . | first 5 }}
     {{ with $related }}
-        <h1 class="widget-title">{{ T "relatedContents" }}</h1>
+        <h2 class="section-title">{{ T "relatedContents" }}</h2>
         <div class="related-contents">
             <div class="flex article-list--tile">
                 {{ range . }}
diff --git a/layouts/partials/widget/archives.html b/layouts/partials/widget/archives.html
index 2aadfcd..038b669 100644
--- a/layouts/partials/widget/archives.html
+++ b/layouts/partials/widget/archives.html
@@ -2,24 +2,26 @@
     <div class="widget-icon">
         {{ partial "helper/icon" "infinity" }}
     </div>
-    <h1 class="widget-title">{{ T "widgetArchivesTitle" }}</h1>
+    <h2 class="widget-title section-title">{{ T "widgetArchivesTitle" }}</h2>
 
     {{ $pages := where .Site.RegularPages "Type" "in" .Site.Params.mainSections }}
     {{ $notHidden := where .Site.RegularPages "Params.hidden" "!=" true }}
     {{ $filtered := ($pages | intersect $notHidden) }}
     {{ $archives := $filtered.GroupByDate "2006" }}
-
-    {{ range $index, $item := first (add .Site.Params.widgets.archives.limit 1) ($archives) }}
-        {{- $id := lower (replace $item.Key " " "-") -}}
-        <div class="archives-year">
-            <a href="{{ $.Site.Params.widgets.archives.path | relLangURL }}#{{ $id }}">
-                {{ if eq $index $.Site.Params.widgets.archives.limit }}
-                    <span class="year">{{ T "widgetArchivesMore" }}</span>
-                {{ else }}
-                    <span class="year">{{ .Key }}</span>
-                    <span class="count">{{ len $item.Pages }}</span>
-                {{ end }}
-            </a> 
-        </div>
-    {{ end }}
-</section>
+    
+    <div class="widget-archive--list">
+        {{ range $index, $item := first (add .Site.Params.widgets.archives.limit 1) ($archives) }}
+            {{- $id := lower (replace $item.Key " " "-") -}}
+            <div class="archives-year">
+                <a href="{{ $.Site.Params.widgets.archives.path | relLangURL }}#{{ $id }}">
+                    {{ if eq $index $.Site.Params.widgets.archives.limit }}
+                        <span class="year">{{ T "widgetArchivesMore" }}</span>
+                    {{ else }}
+                        <span class="year">{{ .Key }}</span>
+                        <span class="count">{{ len $item.Pages }}</span>
+                    {{ end }}
+                </a> 
+            </div>
+        {{ end }}
+    </div>
+</section>
\ No newline at end of file
diff --git a/layouts/partials/widget/tag-cloud.html b/layouts/partials/widget/tag-cloud.html
index 63bddd6..8f201a5 100644
--- a/layouts/partials/widget/tag-cloud.html
+++ b/layouts/partials/widget/tag-cloud.html
@@ -2,7 +2,7 @@
     <div class="widget-icon">
         {{ partial "helper/icon" "tag" }}
     </div>
-    <h1 class="widget-title">{{ T "widgetTagCloudTitle" }}</h1>
+    <h2 class="widget-title section-title">{{ T "widgetTagCloudTitle" }}</h2>
 
     <div class="tagCloud-tags">
         {{ range first .Site.Params.widgets.tagCloud.limit .Site.Taxonomies.tags.ByCount }}