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CSS

width: 100px;
height: 100px;
background:
  linear-gradient(0deg, rgb(69 255 143 / 0) 45%, rgb(69 168 255 / 1) 45%, rgb(69 168 255 / 1) 54%, rgb(69 168 255 / 0) 54%) 40px 40px / 20px 20px no-repeat no-repeat, /* Plus */
  linear-gradient(90deg, rgb(69 255 143 / 0) 45%, rgb(69 168 255 / 1) 45%, rgb(69 168 255 / 1) 54%, rgb(69 168 255 / 0) 54%) 40px 40px / 20px 20px no-repeat no-repeat, /* Plus */
  radial-gradient(ellipse at 50% 50%, rgb(255 255 255 / 1) 34.5%, rgb(69 168 255 / 1) 35%, rgb(69 168 255 / 1) 36.5%, rgb(69 168 255 / 0) 37%) 0px 0px / 100px 100px no-repeat no-repeat, /* Circle */
  linear-gradient(90deg, rgb(69 255 143 / 0) 49%, rgb(69 168 255 / 1) 49%, rgb(69 168 255 / 1) 51%, rgb(69 168 255 / 0) 51%) 0px 0px / 100px 100px no-repeat no-repeat; /* Line */