.fourcol-split-row-6-6--6-6 .arc--2 .l-r,
.fourcol-split-row-6-6--6-6 .arc--3 .l-r:first-child,
.fourcol-split-row-6-6--6-6 .arc--4 .l-r {
  width: 50%;
}

.fourcol-split-row-6-6--6-6 .arc--3 .l-r:nth-child(2) {
  width: 50%;
}