/*html, body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}*/

div {
    border: 1px solid black;
}

.noMargins {
    position: absolute;
    top: 0;
    border: 0;
    margin: 0;
    width: 100%;
    height: 100%;
    box-sizing:border-box;
    -moz-box-sizing:border-box;
    -webkit-box-sizing:border-box;
}

.iframessa {
    margin:0;
    padding:0;
    overflow:hidden;
}