CSS for slope curverd corner of a DIV

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My attempt, as posted in comments (http://jsfiddle.net/8Zm96/):

div{
    width: 300px;
    height: 280px;
    background: #fff;
    border: solid 1px red;
    border-width: 0 1px 1px 1px;
    border-radius: 4px;
    margin-top: 40px;
    position: relative;
}

div:before{
    content: '';
    position: absolute;
    top: -20px;
    right: -1px;
    border: solid 1px red;
    border-width: 1px 1px 0 0;
    border-radius: 25px 4px 0 0;
    height: 24px;
    width: 250px;
    background: #fff;
}

div:after{
    content: '';    
    position: absolute;
    top: -20px;
    left: 2px;
    border: solid 1px red;
    border-width: 0 0 1px 0;
    border-radius: 0 0 20px 0;
    height: 20px;
    width: 55px;
    background: #fff;
}

Zoomed up close, the left corner doesn’t fit, and the two semi-curves actually curve past each other, but none of that is visible at normal zoom. This may be an issue for phones and high-res screens which may display the content zoomed in, or more accurately at the normal zoom.

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