Blur part of an image with CSS

I have set the overflow property of the outer div to hidden and the margin-right of the inner one to -1 and it worked like a charm.

#image {
    ...
    overflow: hidden;
}

#image .blur {
    ...
    margin-right: -1px;
}

Here is the working example in JSFiddle.

#image {
    width: 940px;
    height: 360px;
    overflow: hidden;
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/Nuvola_wikipedia_icon.png/240px-Nuvola_wikipedia_icon.png');
}

#image .blur {
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/thumb/e/e3/Nuvola_wikipedia_icon.png/240px-Nuvola_wikipedia_icon.png');
    background-position: center right;
    -webkit-filter: blur(3px);
    -moz-filter: blur(3px);
    -o-filter: blur(3px);
    -ms-filter: blur(3px);
    filter: blur(3px);
    filter: blur(3px);
    float: right;
    height: 100%;
    width: 360px;
    margin-right: -1px;
}
<div id="image">
    <div class="blur"></div>
</div>

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