_heart.scss

@mixin heart($size: 10px,
             $color: red,
             $animation: true,
             $animation-duration: 0.5s) {
  & {
    position: relative;
    display: inline-block;
    width: $size;
    height: $size;
    background-color: $color;
    @if $animation {
      animation: pulse $animation-duration infinite alternate ease-in;
    }
  }

  &:before,
  &:after {
    content: '';
    position: absolute;
    width: $size;
    height: $size;
    background-color: $color;
    border-radius: 50%;
  }

  &:before {
    top: 0;
    left: 50%;
  }

  &:after {
    top: 50%;
    left: 0;
  }

  @keyframes pulse {
    from {
      transform: rotate(-135deg) scale(1);
    }
    to {
      transform: rotate(-135deg) scale(1.2);
    }
  }
}