.mask {

position: fixed;

z-index: 1000;

top: 0;

right: 0;

left: 0;

bottom: 0;

background-size: 100%;

opacity: 0.3;

filter: hue-rotate(90deg);

/*         filter: Invert(); */

background-image: url(‘designBackground.jpg’);

/*                 filter:grayscale(); */

}

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