.element {
background: repeating-linear-gradient(
45deg,
darkorchid,
darkorchid 40px,
turquoise 40px,
turquoise 80px,
chartreuse 80px,
chartreuse 120px
);
background-size: 100px 100%;
}
.element {
mask-image: repeating-linear-gradient(
to right,
black 100px,
black 200px,
transparent 200px,
transparent 300px
);
}