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<div class="contents">
  <h2>横へスクロール出来ます</h2>
  <div class="slide">
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/08/18/44/horse-5018509_640.jpg">
    </div>
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/10/20/25/cat-5027705_640.jpg">
    </div>
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/10/20/22/giraffe-5027700_640.jpg">
    </div>
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/11/21/23/dog-5032072_640.jpg">
    </div>
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/11/21/51/eurasian-pygmy-owl-5032128_640.jpg">
    </div>
    <div class="item">
      <img src="https://cdn.pixabay.com/photo/2020/04/11/20/06/flamingos-5031849_640.jpg">
    </div>
  </div>
</div>

h2,img{
	margin: 0;
	padding: 0;
	border: 0;
	font-weight: normal;
	font-size: 100%;
	vertical-align:baseline;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

html {
    /* ルートのフォントサイズを10pxに設定しておく */
	font-size: 62.5%;
}

body {
  	line-height: 1;
	/* ルートのフォントサイズを1.6em（16pxと同等のサイズ）に設定 */
	font-size: 1.6em;
}


.contents {
  position: relative;
  margin: 0 auto;
  width: 1000px;
  margin-bottom: 32px;
}

.contents h2 {
  content: "横に進みます";
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 100%;
  font-size: 4rem;
  font-family: kazuraki-sp2n, serif;
  writing-mode: vertical-lr;
  background-color: rgb(255,255,255);
}

.slide {
  display: flex;
  padding: 30px;
  width: calc(100% - 80px);
  overflow-x: auto;
}

.item {
  flex: 0 0 40%;
  background-color: #f4f4f4;
  box-shadow: 0 0 5px rgba(0,0,0,.3);
  overflow: hidden;
}

.item:not(:last-child) {
  margin-right: 20px;
}

.item img {
  display: block;
  width: 100%;
  height: auto;
}

@media screen and (max-width: 1000px) {
  .contents {
    width: 100%;
  }
}

@media screen and (max-width: 767px) {
  .contents h2 {
    font-size: 2.6rem;
  }
}

.slide::-webkit-scrollbar {
  height: 10px;
}

.slide::-webkit-scrollbar-thumb {
  background-color: #ffd700;
  border-radius: 10px;
}

.slide::-webkit-scrollbar-track {
  background-color: transparent;
}

body::-webkit-scrollbar {
  width: 10px;
}

body::-webkit-scrollbar-thumb {
  background-color: #00a7ff;
  border-radius: 10px;
}

body::-webkit-scrollbar-track {
  background-color: transparent;
}