.acid_arrow {
  transform: matrix(0.24, -0.97, -0.97, -0.24, 0, 0);
}

.biotin_arrow {
  transform: matrix(-0.86, -0.51, -0.51, 0.86, 0, 0);
}

.selenium_arrow {
  transform: matrix(-0.19, 0.98, 0.98, 0.19, 0, 0);
}

.zinc_arrow {
  transform: rotate(-104.03deg);
}