.masked1 {

background-image
: linear-gradient (-45deg,
rgb(251, 102, 100) 50%,
white 50%);

-webkit-mask-image
:radial-gradient (circle at 50% 50%,
rgba(255, 255, 255, 0) 26%,
rgba(255, 255, 255, 100) 26%,
rgba(255, 255, 255, 100) 43%,
rgba(255, 255, 255, 0) 67%);
}
.masked1.aliased {

background-image
: linear-gradient (-45deg,
rgb(251, 102, 100) 49.6%,
rgb(255, 255, 255) 50%);

-webkit-mask-image
:radial-gradient (circle at 50% 50%,
rgba(255, 255, 255, 0) 26.5%,
rgba(255, 255, 255, 100) 27%,
rgba(255, 255, 255, 100) 43%,
rgba(255, 255, 255, 0) 67%);
}