.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(); */
}