How to remove white border from blur background image

问题

How to remove the white blur border from the background image.

<div class="background-image"></div> 

CSS, i tried adding margin:-10px but it doesn't work

.background-image {
  background: no-repeat center center fixed; 
   background-image: url('http://www.hdpaperz.com/wallpaper/original/windows-8-wallpapers-2560x1600-2311_1.jpg') ; 
  background-size: cover;
  display: block;
  height: 100%;
  left: -5px;
  top:-5px;
  bottom:-5px;
  position: fixed;
  right: -5px;
  z-index: 1;
  margin:0px auto;
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;

 }

http://jsfiddle.net/maio/8wq132nd/1/

回答1:

The simplest way to do it is by adding transform: scale(1.1). Try it here.

#overlay {
 position: fixed;
 left: 22.5em;
 top: 3em;
 height: 75%;
 width: 50%;
 background: url("https://s-media-cacheak0.pinimg.com/originals/ae/b4/c5/aeb4c53cab2b550187644af503a0f17e.png");
 background-size: cover;
 filter: blur(9px);
 transform: scale(1.1); 
}

回答2:

I have added overflow, padding and even margin, but still the problem not solved. So i tried to give the image tag between div. Problem solved.

<div class="background-image">
<img src="http://www.hdpaperz.com/wallpaper/original/windows-8-wallpapers-2560x1600-2311_1.jpg" width="100%" height="100%"/>
</div>

css

 .background-image {
  background: no-repeat center center fixed; 
  background-size: cover;
  display: block;
  left: -5px;
  top:-5px;
  bottom:-5px;
  position: fixed;
  right: -5px;
  z-index: 1;
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
  filter: blur(5px);
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  margin:-5px;

 }

js fiddle

http://jsfiddle.net/2pgdttLh/

回答3:

I noticed that the white border comes from the body's background-color. If you set it to other colors, you can see the white border color changing to whatever you set it to.

Just do this

body {
  background-color: black; //or whatever color is nearest to your blurred background
}

回答4:

padding: 10px 10px;

add this in your css to remove the white blur border for bottom

回答5:

If you want to remove white border around picture you can use css Clip property.

You can read more here

http://tympanus.net/codrops/2013/01/16/understanding-the-css-clip-property/

http://demosthenes.info/blog/534/Cross-browser-Image-Blur-with-CSS

回答6:

I added a negative margin to the container: margin: -5px

回答7:

This worked for me: Added two fixed images, one with z=-1, other with z=0, blurred the first one.

回答8:

Here's a function I settled on based on @Prime 's answer.

In order for it to work the image must be positioned inside a <div/> having the width and height of the image (explicitly set).

    function addBlur(style, radius) {
      return {
        ...style,
        // https://caniuse.com/#feat=css-filters
        filter: `blur(${radius}px)`,
        // Works around the white edges bug.
        // https://stackoverflow.com/questions/28870932/how-to-remove-white-border-from-blur-background-image
        width: `calc(100% + ${2 * radius}px)`,
        height: `calc(100% + ${2 * radius}px)`,
        marginLeft: `-${radius}px`,
        marginTop: `-${radius}px`
      }
    }

回答9:

If the white borders are caused by the background color of the body, apply margin: 0; on body since margins are not 0 by default;

来源：https://stackoverflow.com/questions/28870932/how-to-remove-white-border-from-blur-background-image