diff --git a/src/lib/danmaku/api.ts b/src/lib/danmaku/api.ts
index 1a497d0..78c1e64 100644
--- a/src/lib/danmaku/api.ts
+++ b/src/lib/danmaku/api.ts
@@ -267,7 +267,7 @@ export const DEFAULT_DANMAKU_SETTINGS: DanmakuSettings = {
   fontSize: 25,
   speed: 5,
   marginTop: 10,
-  marginBottom: 50,
+  marginBottom: '50%',
   maxlength: 100,
   filterRules: [],
   unlimited: false,
diff --git a/src/lib/danmaku/types.ts b/src/lib/danmaku/types.ts
index 642c2b7..229a2df 100644
--- a/src/lib/danmaku/types.ts
+++ b/src/lib/danmaku/types.ts
@@ -52,7 +52,7 @@ export interface DanmakuSettings {
   fontSize: number; // 字体大小
   speed: number; // 弹幕速度 (5-20)
   marginTop: number; // 顶部边距
-  marginBottom: number; // 底部边距
+  marginBottom: number | string; // 底部边距（数字或百分比字符串如"50%"）
   maxlength: number; // 最大弹幕数
   filterRules: string[]; // 过滤规则（正则表达式）
   unlimited: boolean; // 无限弹幕