.splashAnimation() {
  color: @black;

  &:after {
    background: transparent;
  }

  &:before {
    opacity: 1;
  }
}

.splash-btn {
  outline: none;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: 0;

  &:not(.yellow-btn):not(.white-btn) {
    color: @lightText;
  }

  &.yellow-btn,
  &.white-btn {
    color: @darkText;
  }

  &:before {
    content: "";
    background: linear-gradient(
      45deg,
      #ff0000,
      #ff7300,
      #fffb00,
      #48ff00,
      #00ffd5,
      #002bff,
      #7a00ff,
      #ff00c8,
      #ff0000
    );
    position: absolute;
    top: -2px;
    left: -2px;
    background-size: 400%;
    z-index: -1;
    filter: blur(5px);
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    animation: glowing 20s linear infinite;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
  }

  &:after {
    z-index: -1;
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
  }

  &:hover {
    .splashAnimation();
  }

  &.animated {
    .splashAnimation();
  }
}

@keyframes glowing {
  0% {
    background-position: 0 0;
  }
  50% {
    background-position: 400% 0;
  }
  100% {
    background-position: 0 0;
  }
}