gistfile1.css

* {
    margin: 0px;
    padding: 0px;
}

html {
    overflow: hidden;
}

img#embed { 
    background: url(../images/checkerboard.gif);
    width: 100%;
}

div#embed {
    width: 100%;

    & > * { 
        display: block;
    }

    & > iframe,
    & > object,
    & > embed {
        width: 100%;
    }
}