diff --git a/packages/frontend/src/components/MkMediaAudio.vue b/packages/frontend/src/components/MkMediaAudio.vue
index 75b31b9a49..53fd3b2d55 100644
--- a/packages/frontend/src/components/MkMediaAudio.vue
+++ b/packages/frontend/src/components/MkMediaAudio.vue
@@ -138,7 +138,7 @@ const rangePercent = computed({
 		audioEl.value.currentTime = to * durationMs.value / 1000;
 	},
 });
-const volume = ref(.5);
+const volume = ref(.25);
 const bufferedEnd = ref(0);
 const bufferedDataRatio = computed(() => {
 	if (!audioEl.value) return 0;
@@ -161,7 +161,7 @@ function togglePlayPause() {
 
 function toggleMute() {
 	if (volume.value === 0) {
-		volume.value = .5;
+		volume.value = .25;
 	} else {
 		volume.value = 0;
 	}
@@ -207,7 +207,7 @@ function init() {
 				isActuallyPlaying.value = false;
 				isPlaying.value = false;
 			});
-			
+
 			durationMs.value = audioEl.value.duration * 1000;
 			audioEl.value.addEventListener('durationchange', () => {
 				if (audioEl.value) {
diff --git a/packages/frontend/src/components/MkMediaRange.vue b/packages/frontend/src/components/MkMediaRange.vue
index e6303a5c41..a150ae9843 100644
--- a/packages/frontend/src/components/MkMediaRange.vue
+++ b/packages/frontend/src/components/MkMediaRange.vue
@@ -5,9 +5,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <!-- Media系専用のinput range -->
 <template>
-<div :class="$style.controlsSeekbar" :style="sliderBgWhite ? '--sliderBg: rgba(255,255,255,.25);' : '--sliderBg: var(--scrollbarHandle);'">
-	<progress v-if="buffer !== undefined" :class="$style.buffer" :value="isNaN(buffer) ? 0 : buffer" min="0" max="1">{{ Math.round(buffer * 100) }}% buffered</progress>
-	<input v-model="model" :class="$style.seek" :style="`--value: ${modelValue * 100}%;`" type="range" min="0" max="1" step="any" @change="emit('dragEnded', modelValue)"/>
+<div :style="sliderBgWhite ? '--sliderBg: rgba(255,255,255,.25);' : '--sliderBg: var(--scrollbarHandle);'">
+	<div :class="$style.controlsSeekbar">
+		<progress v-if="buffer !== undefined" :class="$style.buffer" :value="isNaN(buffer) ? 0 : buffer" min="0" max="1">{{ Math.round(buffer * 100) }}% buffered</progress>
+		<input v-model="model" :class="$style.seek" :style="`--value: ${modelValue * 100}%;`" type="range" min="0" max="1" step="any" @change="emit('dragEnded', modelValue)"/>
+	</div>
 </div>
 </template>
 
diff --git a/packages/frontend/src/components/MkMediaVideo.vue b/packages/frontend/src/components/MkMediaVideo.vue
index 977c9020c7..0a113458a1 100644
--- a/packages/frontend/src/components/MkMediaVideo.vue
+++ b/packages/frontend/src/components/MkMediaVideo.vue
@@ -176,7 +176,7 @@ const rangePercent = computed({
 		videoEl.value.currentTime = to * durationMs.value / 1000;
 	},
 });
-const volume = ref(.5);
+const volume = ref(.25);
 const bufferedEnd = ref(0);
 const bufferedDataRatio = computed(() => {
 	if (!videoEl.value) return 0;
@@ -236,7 +236,7 @@ function toggleFullscreen() {
 
 function toggleMute() {
 	if (volume.value === 0) {
-		volume.value = .5;
+		volume.value = .25;
 	} else {
 		volume.value = 0;
 	}
@@ -535,6 +535,9 @@ onDeactivated(() => {
 
 .seekbarRoot {
 	grid-area: seekbar;
+	/* ▼シークバー操作をやりやすくするためにクリックイベントが伝播されないエリアを拡張する */
+	margin: -10px;
+	padding: 10px;
 }
 
 @container (min-width: 500px) {
diff --git a/packages/frontend/src/filters/hms.ts b/packages/frontend/src/filters/hms.ts
index 7b5da965ff..73db7becc2 100644
--- a/packages/frontend/src/filters/hms.ts
+++ b/packages/frontend/src/filters/hms.ts
@@ -5,7 +5,7 @@
 
 import { i18n } from '@/i18n.js';
 
-export function hms(ms: number, options: {
+export function hms(ms: number, options?: {
 	textFormat?: 'colon' | 'locale';
 	enableSeconds?: boolean;
 	enableMs?: boolean;