[data-aos="outline"] {
  color: transparent;
  text-shadow:
    1px 0 0 #000,
    -1px 0 0 #000,
    0 1px 0 #000,
    0 -1px 0 #000,
    1px 1px 0 #000,
    -1px 1px 0 #000,
    1px -1px 0 #000,
    -1px -1px 0 #000;
}
[data-aos="outline"].aos-animate {
    color: #000;
}