CSS blur on background image but not on content [duplicate]

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jsfiddle

.blur-bgimage {
    overflow: hidden;
    margin: 0;
    text-align: left;
}
.blur-bgimage:before {
    content: "";
    position: absolute;
    width : 100%;
    height: 100%;
    background: inherit;
    z-index: -1;

    filter        : blur(10px);
    -moz-filter   : blur(10px);
    -webkit-filter: blur(10px);
    -o-filter     : blur(10px);

    transition        : all 2s linear;
    -moz-transition   : all 2s linear;
    -webkit-transition: all 2s linear;
    -o-transition     : all 2s linear;
}

You can blur the body background image by using the body’s :before pseudo class to inherit the image and then blurring it. Wrap all that into a class and use javascript to add and remove the class to blur and unblur.

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