.option-gradient-mask{--duration:5s;--progress:0.5;animation:mask-move var(--duration) linear infinite;animation-delay:calc(-1 * var(--duration) * var(--progress));mask-image:linear-gradient(to right,transparent calc(0% + var(--mask-position)),transparent calc(2% + var(--mask-position)),black calc(45% + var(--mask-position)),black calc(55% + var(--mask-position)),transparent calc(98% + var(--mask-position)),transparent calc(100% + var(--mask-position)))}@property --mask-position{syntax:"<percentage>";inherits:false;initial-value:-100%}@keyframes mask-move{0%{--mask-position:-100%}to{--mask-position:100%}}