blur only background css code example

Example 1: css backdrop filter grayscale

backdrop-filter: grayscale(30%);

Example 2: css blur background image only

// best workaround is two images layered... (one on left is on top)
background-image: url(opaque_blurred.png), url(regular_bakground_img.jpg);
// BAM! that right there is worth at least a buck donation ;-)