How to remove white border from blur background image

Question

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

CSS, i tried adding marg

Answer 1

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`
      }
    }

Answer 2

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); 
}

Answer 3

padding: 10px 10px;

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