ch {
            width: 100px;
            height: 100px;
            margin: 0;
            position: relative;
            max-height: 100%;
            max-width: 100%;
        }

        .viewer-image-button {
            display: none;
            /* background-color:  #495b79; */
            color: white;
            border: none;
            cursor: pointer;
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            /* height: 20px; */
           