scroll-slidein

HTML

<div class="scroll-space">
  <div class="slidein slidein-left blue">
  左からスライドイン
  </div>
  <div class="slidein slidein-right pink">
  右からスライドイン
  </div>
  <div class="slidein slidein-up yellow">
  上からスライドイン
  </div>
  <div class="slidein slidein-bottom green">
  下からスライドイン
  </div>
</div>

SCSS

.scroll-space{
  box-sizing: border-box;
  padding-top: 300px;
  height: 1600px;
  color: #fff;
  .blue{
    background: #77BBCF;
    width: 200px;
    height: 200px;
    padding: 30px;
    margin: 0 auto 50px;
  }
  .pink{
    background: #FFB4B4;
    width: 200px;
    height: 200px;
    padding: 30px;
    margin: 0 auto 50px;
  }
  .yellow{
    background: #F8913C;
    width: 200px;
    height: 200px;
    padding: 30px;
    margin: 0 auto 50px;
  }
  .green{
    background: #26AA5A;
    width: 200px;
    height: 200px;
    padding: 30px;
    margin: 0 auto 50px;
  }
}
.slidein {
    opacity: 0;
    transform: translate(0,0);
    transition: all 1.0s;
  &.slidein-left{
      transform: translate(-100%,0);
  }
  &.slidein-right{
      transform: translate(100%,0);
  }
  &.slidein-up{
      transform: translate(0,-100%);
  }
  &.slidein-bottom{
      transform: translate(0,100%);
  }
  &.scrollin{
    transform: translate(0, 0)!important;
    opacity: 1!important;
  }
}

JavaScript

$(window).scroll(function (){
	$('.slidein').each(function(){
		var elemPos = $(this).offset().top,
		scroll = $(window).scrollTop(),
		windowHeight = $(window).height();

			if (scroll > elemPos - windowHeight + 150){
				$(this).addClass('scrollin');
			}
	});
});