.video-container {
            position: relative;
            width: 1800px;
            height: 1015px;
            overflow: hidden;
        }

        .video-cover {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: transparent; 
            z-index: 5; 
            cursor: default; 
        }

        #soundToggleBtn {
            position: absolute;
            top: 10px;
            right: 10px;
            padding: 8px 16px;
            background-color: rgba(0, 0, 0, 0.6);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 4px;
            cursor: pointer;
            z-index: 10; 
            display: none;
            transition: background 0.3s;
        }
        #soundToggleBtn:hover { background-color: rgba(0, 0, 0, 0.8); }