diff --git a/components/g/Nav.vue b/components/g/Nav.vue
index 9d53b71e..95bf9eb7 100644
--- a/components/g/Nav.vue
+++ b/components/g/Nav.vue
@@ -1,5 +1,14 @@
 <template>
-    <div :class="['sticky top-0 z-[9900] transition', { 'shadow bg-opacity-90': (!disableShadow && scrollPos <= -40), 'bg-white dark:bg-gray-950': (disableShadow || scrollPos <= -40)}, (slim ? 'h-16 border-b border-slate-300 dark:border-slate-800' : 'h-16 lg:h-20')]">
+    <div
+        :class="[
+            'sticky top-0 z-[9900] transition',
+            {
+                'shadow bg-opacity-90': (!disableShadow && scrollPos <= -40),
+                'bg-white dark:bg-gray-950': (disableShadow || scrollPos <= -40),
+                'border-b border-slate-300 dark:border-slate-800': hasBorder,
+            },
+            (slim ? 'h-16' : 'h-16 lg:h-20'),
+        ]">
         <nav class="container mx-auto max-w-screen-xl grid items-center grid-cols-2 lg:grid-cols-6 p-4 h-full transition-[height]">
             <div class="">
                 <GNuxtLink :to="localePath('/')" class="flex items-center space-x-2 hover:opacity-80">
@@ -90,10 +99,12 @@ import NavData from '@/assets/data/nav';
 const props = withDefaults(defineProps<{
     disableShadow?: boolean;
     slim?: boolean;
+    hasBorder?: boolean;
     landing?: boolean;
 }>(), {
     disableShadow: false,
     slim: false,
+    hasBorder: false,
     landing: false,
 });
 
diff --git a/components/mk/AnimBg.vue b/components/mk/AnimBg.vue
new file mode 100644
index 00000000..ea07f3ad
--- /dev/null
+++ b/components/mk/AnimBg.vue
@@ -0,0 +1,276 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+    <canvas ref="canvasEl" style="width: 100%; height: 100%; pointer-events: none;"></canvas>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, onUnmounted, shallowRef } from 'vue';
+
+const canvasEl = shallowRef<HTMLCanvasElement>();
+
+const props = withDefaults(defineProps<{
+    scale?: number;
+    focus?: number;
+}>(), {
+    scale: 1.0,
+    focus: 1.0,
+});
+
+const emit = defineEmits<{
+    (ev: 'load'): void;
+}>();
+
+function loadShader(gl: WebGLRenderingContext, type: number, source: string) {
+    const shader = gl.createShader(type);
+    if (shader == null) return null;
+
+    gl.shaderSource(shader, source);
+    gl.compileShader(shader);
+
+    if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
+        alert(
+            `falied to compile shader: ${gl.getShaderInfoLog(shader)}`,
+        );
+        gl.deleteShader(shader);
+        return null;
+    }
+
+    return shader;
+}
+
+function initShaderProgram(gl: WebGLRenderingContext, vsSource: string, fsSource: string) {
+    const vertexShader = loadShader(gl, gl.VERTEX_SHADER, vsSource);
+    const fragmentShader = loadShader(gl, gl.FRAGMENT_SHADER, fsSource);
+
+    const shaderProgram = gl.createProgram();
+    if (shaderProgram == null || vertexShader == null || fragmentShader == null) return null;
+
+    gl.attachShader(shaderProgram, vertexShader);
+    gl.attachShader(shaderProgram, fragmentShader);
+    gl.linkProgram(shaderProgram);
+
+    if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
+        alert(
+            `failed to init shader: ${gl.getProgramInfoLog(
+                shaderProgram,
+            )}`,
+        );
+        return null;
+    }
+
+    return shaderProgram;
+}
+
+let handle: ReturnType<typeof window['requestAnimationFrame']> | null = null;
+
+onMounted(() => {
+    if (!process.client) return;
+
+    const canvas = canvasEl.value!;
+    let width = canvas.offsetWidth;
+    let height = canvas.offsetHeight;
+    canvas.width = width;
+    canvas.height = height;
+
+    const gl = canvas.getContext('webgl', { premultipliedAlpha: true });
+    if (gl == null) return;
+
+    gl.clearColor(0.0, 0.0, 0.0, 0.0);
+    gl.clear(gl.COLOR_BUFFER_BIT);
+
+    const positionBuffer = gl.createBuffer();
+    gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
+
+    const shaderProgram = initShaderProgram(gl, `
+		attribute vec2 vertex;
+
+		uniform vec2 u_scale;
+
+		varying vec2 v_pos;
+
+		void main() {
+			gl_Position = vec4(vertex, 0.0, 1.0);
+			v_pos = vertex / u_scale;
+		}
+	`, `
+		precision mediump float;
+
+		vec3 mod289(vec3 x) {
+			return x - floor(x * (1.0 / 289.0)) * 289.0;
+		}
+
+		vec2 mod289(vec2 x) {
+			return x - floor(x * (1.0 / 289.0)) * 289.0;
+		}
+
+		vec3 permute(vec3 x) {
+			return mod289(((x*34.0)+1.0)*x);
+		}
+
+		float snoise(vec2 v) {
+			const vec4 C = vec4(0.211324865405187,
+													0.366025403784439,
+												-0.577350269189626,
+													0.024390243902439);
+
+			vec2 i  = floor(v + dot(v, C.yy) );
+			vec2 x0 = v -   i + dot(i, C.xx);
+
+			vec2 i1;
+			i1 = (x0.x > x0.y) ? vec2(1.0, 0.0) : vec2(0.0, 1.0);
+			vec4 x12 = x0.xyxy + C.xxzz;
+			x12.xy -= i1;
+
+			i = mod289(i);
+			vec3 p = permute( permute( i.y + vec3(0.0, i1.y, 1.0 ))
+				+ i.x + vec3(0.0, i1.x, 1.0 ));
+
+			vec3 m = max(0.5 - vec3(dot(x0,x0), dot(x12.xy,x12.xy), dot(x12.zw,x12.zw)), 0.0);
+			m = m*m ;
+			m = m*m ;
+
+			vec3 x = 2.0 * fract(p * C.www) - 1.0;
+			vec3 h = abs(x) - 0.5;
+			vec3 ox = floor(x + 0.5);
+			vec3 a0 = x - ox;
+
+			m *= 1.79284291400159 - 0.85373472095314 * ( a0*a0 + h*h );
+
+			vec3 g;
+			g.x  = a0.x  * x0.x  + h.x  * x0.y;
+			g.yz = a0.yz * x12.xz + h.yz * x12.yw;
+			return 130.0 * dot(m, g);
+		}
+
+		uniform float u_time;
+		uniform vec2 u_resolution;
+		uniform float u_spread;
+		uniform float u_speed;
+		uniform float u_warp;
+		uniform float u_focus;
+		uniform float u_itensity;
+
+		varying vec2 v_pos;
+
+		float circle( in vec2 _pos, in vec2 _origin, in float _radius ) {
+			float SPREAD = 0.7 * u_spread;
+			float SPEED = 0.00055 * u_speed;
+			float WARP = 1.5 * u_warp;
+			float FOCUS = 1.15 * u_focus;
+
+			vec2 dist = _pos - _origin;
+
+			float distortion = snoise( vec2(
+				_pos.x * 1.587 * WARP + u_time * SPEED * 0.5,
+				_pos.y * 1.192 * WARP + u_time * SPEED * 0.3
+			) ) * 0.5 + 0.5;
+
+			float feather = 0.01 + SPREAD * pow( distortion, FOCUS );
+
+			return 1.0 - smoothstep(
+				_radius - ( _radius * feather ),
+				_radius + ( _radius * feather ),
+				dot( dist, dist ) * 4.0
+			);
+		}
+
+		void main() {
+			vec3 green = vec3( 1.0 ) - vec3( 153.0 / 255.0, 211.0 / 255.0, 221.0 / 255.0 );
+			vec3 purple = vec3( 1.0 ) - vec3( 195.0 / 255.0, 165.0 / 255.0, 242.0 / 255.0 );
+			vec3 orange = vec3( 1.0 ) - vec3( 255.0 / 255.0, 156.0 / 255.0, 136.0 / 255.0 );
+
+			float ratio = u_resolution.x / u_resolution.y;
+
+			vec2 uv = vec2( v_pos.x, v_pos.y / ratio ) * 0.5 + 0.5;
+
+			vec3 color = vec3( 0.0 );
+
+			float greenMix = snoise( v_pos * 1.31 + u_time * 0.8 * 0.00017 ) * 0.5 + 0.5;
+			float purpleMix = snoise( v_pos * 1.26 + u_time * 0.8 * -0.0001 ) * 0.5 + 0.5;
+			float orangeMix = snoise( v_pos * 1.34 + u_time * 0.8 * 0.00015 ) * 0.5 + 0.5;
+
+			float alphaOne = 0.35 + 0.65 * pow( snoise( vec2( u_time * 0.00012, uv.x ) ) * 0.5 + 0.5, 1.2 );
+			float alphaTwo = 0.35 + 0.65 * pow( snoise( vec2( ( u_time + 1561.0 ) * 0.00014, uv.x ) ) * 0.5 + 0.5, 1.2 );
+			float alphaThree = 0.35 + 0.65 * pow( snoise( vec2( ( u_time + 3917.0 ) * 0.00013, uv.x ) ) * 0.5 + 0.5, 1.2 );
+
+			color += vec3( circle( uv, vec2( 0.22 + sin( u_time * 0.000201 ) * 0.06, 0.80 + cos( u_time * 0.000151 ) * 0.06 ), 0.15 ) ) * alphaOne * ( purple * purpleMix + orange * orangeMix );
+			color += vec3( circle( uv, vec2( 0.90 + cos( u_time * 0.000166 ) * 0.06, 0.42 + sin( u_time * 0.000138 ) * 0.06 ), 0.18 ) ) * alphaTwo * ( green * greenMix + purple * purpleMix );
+			color += vec3( circle( uv, vec2( 0.19 + sin( u_time * 0.000112 ) * 0.06, 0.25 + sin( u_time * 0.000192 ) * 0.06 ), 0.09 ) ) * alphaThree * ( orange * orangeMix );
+
+			color *= u_itensity + 1.0 * pow( snoise( vec2( v_pos.y + u_time * 0.00013, v_pos.x + u_time * -0.00009 ) ) * 0.5 + 0.5, 2.0 );
+
+			vec3 inverted = vec3( 1.0 ) - color;
+			gl_FragColor = vec4( color, max(max(color.x, color.y), color.z) );
+		}
+	`);
+    if (shaderProgram == null) return;
+
+    gl.useProgram(shaderProgram);
+    const u_resolution = gl.getUniformLocation(shaderProgram, 'u_resolution');
+    const u_time = gl.getUniformLocation(shaderProgram, 'u_time');
+    const u_spread = gl.getUniformLocation(shaderProgram, 'u_spread');
+    const u_speed = gl.getUniformLocation(shaderProgram, 'u_speed');
+    const u_warp = gl.getUniformLocation(shaderProgram, 'u_warp');
+    const u_focus = gl.getUniformLocation(shaderProgram, 'u_focus');
+    const u_itensity = gl.getUniformLocation(shaderProgram, 'u_itensity');
+    const u_scale = gl.getUniformLocation(shaderProgram, 'u_scale');
+    gl.uniform2fv(u_resolution, [width, height]);
+    gl.uniform1f(u_spread, 1.0);
+    gl.uniform1f(u_speed, 1.0);
+    gl.uniform1f(u_warp, 1.0);
+    gl.uniform1f(u_focus, props.focus);
+    gl.uniform1f(u_itensity, 0.5);
+    gl.uniform2fv(u_scale, [props.scale, props.scale]);
+
+    const vertex = gl.getAttribLocation(shaderProgram, 'vertex');
+    gl.enableVertexAttribArray(vertex);
+    gl.vertexAttribPointer(vertex, 2, gl.FLOAT, false, 0, 0);
+
+    const vertices = [1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0];
+    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.DYNAMIC_DRAW);
+
+    let animStarted = false;
+
+    function render(timeStamp: number) {
+        let sizeChanged = false;
+        if (Math.abs(height - canvas.offsetHeight) > 2) {
+            height = canvas.offsetHeight;
+            canvas.height = height;
+            sizeChanged = true;
+        }
+        if (Math.abs(width - canvas.offsetWidth) > 2) {
+            width = canvas.offsetWidth;
+            canvas.width = width;
+            sizeChanged = true;
+        }
+        if (sizeChanged && gl) {
+            gl.uniform2fv(u_resolution, [width, height]);
+            gl.viewport(0, 0, width, height);
+        }
+
+        gl!.uniform1f(u_time, timeStamp);
+        gl!.drawArrays(gl!.TRIANGLE_STRIP, 0, 4);
+
+        if (!animStarted) {
+            emit('load');
+            animStarted = true;
+        }
+
+        handle = window.requestAnimationFrame(render);
+    }
+
+    handle = window.requestAnimationFrame(render);
+});
+
+onUnmounted(() => {
+    if (handle) {
+        window.cancelAnimationFrame(handle);
+    }
+});
+</script>
+
+<style lang="scss" module></style>
\ No newline at end of file
diff --git a/error.vue b/error.vue
index 94e4c135..df902db0 100644
--- a/error.vue
+++ b/error.vue
@@ -1,11 +1,88 @@
 <template>
-	<div class="text-slate-800 dark:text-slate-200 bg-slate-100 dark:bg-gray-900">
+	<div class="min-h-screen text-slate-800 dark:text-slate-200 bg-slate-100 dark:bg-gray-900">
         <NuxtIsland name="GNoScript" />
-        ページが見つかりませんでした
-		<pre>{{ error }}</pre>
+        <MkAnimBg
+            class="fixed z-0 top-0 left-0 w-screen h-screen transition-opacity duration-[2s]"
+            :class="isCanvasLoaded ? 'opacity-100' : 'opacity-0'"
+            @load="isCanvasLoaded = true"
+        ></MkAnimBg>
+        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" />
+        <div :class="$style.errorContainer" class="relative z-10 flex items-center justify-center">
+            <div class="max-w-xl w-full p-6 mx-6 bg-white/70 dark:bg-white/20 shadow-black/10 shadow-xl rounded-xl">
+                <img src="https://xn--931a.moe/assets/error.jpg" class="w-32 h-32 rounded-xl mx-auto mb-6" />
+                <div v-if="error">
+                    <h1 class="text-center font-bold text-2xl mb-4">{{ error?.statusCode === 404 ? $t('_error.notFound') : $t('_error.generalError') }}</h1>
+                    <p class="text-center mb-4">{{ error?.statusCode === 404 ? $t('_error.notFoundDesc') : $t('_error.generalErrorDesc') }}</p>
+                    <div class="max-w-lg w-full mx-auto grid grid-cols-1 sm:grid-cols-2 gap-4">
+                        <button class="block rounded-full text-center px-4 py-2 border-2 hover:opacity-70" @click="handleError">{{ $t('_error.goToTop') }}</button>
+                        <GNuxtLink class="block rounded-full text-center px-4 py-2 border-2 hover:opacity-70" target="_blank" to="https://github.com/misskey-dev/misskey-hub/issues/new">{{ $t('_error.reportProblem') }}</GNuxtLink>
+                    </div>
+                </div>
+                <div v-else class="mx-auto py-5">
+                    <MkLoading />
+                </div>
+            </div>
+        </div>
 	</div>
 </template>
 
 <script setup lang="ts">
+import NProgress from 'nprogress';
+
 const error = useError();
-</script>
\ No newline at end of file
+const colorMode = useColorMode();
+
+const { locale, locales } = useI18n();
+const localePath = useLocalePath();
+const currentLocaleIso = computed(() => (locales.value as LocaleObject[]).find((e) => e?.code === locale.value)?.iso);
+
+const isNavOpen = ref<boolean>(false);
+const isCanvasLoaded = ref<boolean>(false);
+
+const handleError = () => clearError({ redirect: localePath('/') });
+
+/** 
+ * 中国大陸で Google Fonts を使う裏技
+ * fonts.googleapis.com → fonts.googleapis.cn
+ **/
+ const cnHead = (locale.value === 'cn') ? [
+    { rel: 'preconnect', href: 'https://fonts.googleapis.cn' },
+    { rel: 'preconnect', href: 'https://fonts.gstatic.cn' },
+    { rel: 'stylesheet', href: 'https://fonts.googleapis.cn/css2?family=Capriola&family=Nunito:ital,wght@0,400;0,700;1,400;1,700&display=swap' }
+] : [
+    { rel: 'preconnect', href: 'https://fonts.googleapis.com' },
+    { rel: 'preconnect', href: 'https://fonts.gstatic.com' },
+    { rel: 'stylesheet', href: 'https://fonts.googleapis.com/css2?family=Capriola&family=Nunito:ital,wght@0,400;0,700;1,400;1,700&display=swap' },
+];
+
+useHead({
+    htmlAttrs: {
+        lang: currentLocaleIso.value,
+        'data-bs-theme': colorMode.value,
+        class: 'scroll-pt-20 lg:scroll-pt-24',
+    },
+    link: [
+        ...cnHead,
+    ],
+});
+
+onMounted(() => {
+    nextTick(() => {
+        setTimeout(() => {
+            NProgress.done();
+        }, 100);
+    });
+})
+</script>
+
+<style module>
+.errorContainer {
+    min-height: calc(100vh - 4rem);
+}
+
+@screen lg {
+    .errorContainer {
+        min-height: calc(100vh - 5rem);
+    }
+}
+</style>
diff --git a/layouts/docs.vue b/layouts/docs.vue
index f9ad69f7..d5703e15 100644
--- a/layouts/docs.vue
+++ b/layouts/docs.vue
@@ -25,7 +25,7 @@ watch(locale, async (to) => {
 
 <template>
     <div class="bg-white dark:bg-slate-950">
-        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" />
+        <GNav @toggleNav="isNavOpen = !isNavOpen" :isOpen="isNavOpen" :slim="true" :disableShadow="true" :hasBorder="true" />
         <div class="main-content">
             <div class="relative container mx-auto max-w-screen-xl p-6 lg:py-0 grid docs-root pb-12">
                 <div
diff --git a/layouts/slim.vue b/layouts/slim.vue
index fb4ba23c..bc41e7e7 100644
--- a/layouts/slim.vue
+++ b/layouts/slim.vue
@@ -11,7 +11,7 @@ useHead({
 
 <template>
     <div class="bg-white dark:bg-slate-950">
-        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" />
+        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" :hasBorder="true" />
         <div class="main-content" :class="$style.slimPageRoot">
             <slot />
         </div>
diff --git a/layouts/tools.vue b/layouts/tools.vue
index c13c8f0f..6624df1d 100644
--- a/layouts/tools.vue
+++ b/layouts/tools.vue
@@ -27,7 +27,7 @@ const route = useRoute();
 
 <template>
     <div class="bg-white dark:bg-slate-950">
-        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" />
+        <GNav @toggleNav="isNavOpen = !isNavOpen" :is-open="isNavOpen" :slim="true" :disable-shadow="true" :hasBorder="true" />
         <div :class="$style.slimPageRoot" class="overflow-x-hidden">
             <aside
                 class="w-80 lg:w-72 fixed top-0 mt-16 h-screen flex transition-transform lg:translate-x-0"
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 2b08abf2..cb230d8d 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -6,6 +6,14 @@ copy: "コピー"
 share: "共有する"
 note: "ノート"
 
+_error:
+  notFound: "ページが見つかりませんでした"
+  notFoundDesc: "お探しのページは見つかりませんでした。URLをお確かめください。"
+  generalError: "エラーが発生しました"
+  generalErrorDesc: "これが意図した操作でない場合は、以下から不具合報告をお願いします。"
+  reportProblem: "問題を報告する"
+  goToTop: "トップページにもどる"
+
 _seo:
   siteName: "Misskey Hub"
   siteNameLong: "Misskey Hub – Misskeyプロジェクト 公式サイト"