CSS filter blur not blurring edges - css

Question

When I apply the blur filter to my markup the edges are not being blurred. I would like the entire region to be blurred.
HTML
<div class="container">
<div class="inner">
<div class="image">
</div>
</div>
</div>
CSS
.container {
width: 300px;
height: 250px;
}
.inner {
width: 100%;
height: 100%;
position: relative;
}
.image {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(/images/400x300.jpg) no-repeat center center fixed;
background-size: fill;
}
.image:before {
left: 0;
right: 0;
bottom: 0px;
content: "text";
position: absolute;
height: 20%;
width: 100%;
background: url(/images/400x300.jpg) no-repeat center center fixed;
background-size: fill;
-webkit-filter: blur(12px);
filter: blur(12px);
}
Codepen:
http://codepen.io/aaronbalthaser/pen/qNOYdE
The Codepen shows the blurred region. It is kind of like a footer but as you can see the edges are not blurred. Any ideas?
Thanks

Answer 1

You can set overflow: hidden and stretch a little bit the blurred image. I have set width to 110%, height to 35%, left, right and bottom to -5% (the added percentage to width and height). Hope this is what you want.
html,
body{
width: 100%;
height: 100%;
overflow: hidden;
margin: 0;
padding: 0;
}
body {
display: flex;
align-items: center;
justify-content: center;
}
.container {
width: 300px;
height: 250px;
}
.inner {
width: 100%;
height: 100%;
position: relative;
overflow: hidden;
}
.image {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(http://attic24.typepad.com/.a/6a00e551101c548834017d3d4fde82970c-500wi) no-repeat center center fixed;
background-size: fill;
}
.image:before {
left: -5%;
right: -5%;
bottom: -5%;
content: "";
position: absolute;
height: 35%;
width: 110%;
background: url(http://attic24.typepad.com/.a/6a00e551101c548834017d3d4fde82970c-500wi) no-repeat center center fixed;
background-size: fill;
-webkit-filter: blur(8px);
filter: blur(8px);
overflow: hidden;
}
<div class="container">
<div class="inner">
<div class="image">
</div>
</div>
</div>