{
            position: relative;
        }
        .container__textarea {
            background: transparent;
            position: relative;
        }
        .container__mirror {
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            width: 100%;
            overflow: hidden;
            color: transparent;
        }
        </style>
    </head>
    <body>
        <div class="container" id="container">
            <textarea id="textarea" class="con