.btn {
  &,
  &:link,
  &:visited {
    position: relative;
    cursor: pointer;
    z-index: 1;
  }

  &--e2 {
    &::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      display: inline-block;
      height: 100%;
      width: 100%;
      //transition: all $transition-duration;
      z-index: -1;
    }

    &:hover {
      // transform: translateY($translate-y-1);
      // box-shadow: $shadow-dark-small;

      &::after {
        //transform: scaleX($scale-4) scaleY($scale-6);
        opacity: 0;
      }
    }

    &:active,
    &focus {
      /* Click state */
      outline: none;
      // transform: translateY(-0.1rem);
      // box-shadow: $shadow-dark-tiny;
    }
  }

  &--e3 {
    &::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      height: 100%;
      width: 100%;
      background-size: 400%;
      //transform: scale($scale-1);
      opacity: 0;
      //transition: all $transition-duration;
      z-index: -1;
    }

    &:hover {
      animation: bg-position 6s linear infinite;

      &::before {
        filter: blur(20px);
        opacity: 1;
        animation: bg-position 6s linear infinite;
      }
    }
  }
}