Remove div spaces with image using Canvas

I have a div, where I'm saving content using canvas

<div class="container-capa">
    <img src=~/Content/imagemcartaovisita/@Session["NomeCapaCartao"] class="img-responsive" id="capa" alt="" width="589" height="324">
    <label id="caminhosite">@Session["CaminhoSiteUsuario"]</label>
</div>

In the Js function I'm passing the same image size,

$(function () {
    $("#btnSaveCartaoCapa").click(function () {
        html2canvas($(".container-capa"), {
            onrendered: function (canvas) {
                theCanvas = canvas;
                // document.body.appendChild(canvas);

                // Convert and download as image
                Canvas2Image.saveAsPNG(canvas, 589, 324);
                //$(".main-footer").append(canvas);
                // Clean up
                //document.body.removeChild(canvas);
            }
        });
    });
});

And in css:

.container-capa{
    left: 0px;
    top: 0px;
    padding-bottom: 0%;
    padding-top: 0px;
}

The problem is that when saving the file the image does not come in the correct size, comes a blank, the image comes with w280 and h300: Red would be the image and the green space