.player {
            bottom: 200px;
            width: 80%;
            max-width: 400px;
            transition: all 0.3s ease;
            height: 10em;
            position: relative;
            margin-left: auto;
            margin-right: auto;
        }
        div.container4 {
            height: 10em;
            position: relative }
        
        audio {
            width: 100%;
            border-radius: 12px;
        }