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HTML

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CSS

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JavaScript

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HTML 

              
                <div class="section">

  <div class="tabBox">
    <div class="tabArea">
      <div id="tab01" class="one_tab select"><span class="tab_inner">Tab1</span></div>
      <div id="tab02" class="one_tab"><span class="tab_inner">Tab2</span></div>
      <div id="tab03" class="one_tab"><span class="tab_inner">Tab3</span></div>
    </div>
  </div><!-- /.tabBox -->

  <div class="contents">

    <div class="tab_main is_show">
      <div class="innerArea">Tab1 text</div>
    </div>

    <div class="tab_main">
      <div class="innerArea">Tab2 text</div>
    </div>

    <div class="tab_main">
      <div class="innerArea">Tab3 text</div>
    </div>

  </div><!--contents-->

  <!-- ▼Tab under▼ -->
  <div class="tabBox">
    <div class="tabArea bottom">
      <div class="one_tab select"><span class="tab_inner">Tab1</span></div>
      <div class="one_tab"><span class="tab_inner">Tab2</span></div>
      <div class="one_tab"><span class="tab_inner">Tab3</span></div>
    </div>
  </div><!-- /.tabBox -->

  <p class="_a"><a href="https://125naroom.com/web/2854" target="_blank" class="link">View the note</a></p>
</div>
!

CSS 

              
                .tabBox .tabArea {
  width: 100%;
  height: 80px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
}
.tabBox .tabArea .one_tab {
  width: 32.5%;
  display: block;
  text-decoration: none;
  transition-duration: 0.3s;
  text-align: center;
  color: #fff;
  cursor: pointer;
}
.tabBox .tabArea .one_tab:hover {
  opacity: 0.7;
  text-decoration: none;
}
.tabBox .tabArea .one_tab .tab_inner {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 60px;
  transition-duration: 0.3s;
}
.tabBox .tabArea .one_tab:nth-child(1) .tab_inner {
  background-color: #94ad73;
}
.tabBox .tabArea .one_tab:nth-child(2) .tab_inner {
  background-color: #e6de6b;
}
.tabBox .tabArea .one_tab:nth-child(3) .tab_inner {
  background-color: #e8a48b;
}
.tabBox .tabArea .one_tab.select .tab_inner {
  height: 80px;
}
.tabBox .tabArea.bottom {
  align-items: flex-start;
}
.contents .tab_main {
  display: none;
  padding: 50px 25px;
  text-align: center;
  min-height: 280px;
  border: 2px solid #94ad73;
  transition-duration: 0.3s;
}
.tab_main.is_show {
  display: block;
}
.tab_main:nth-child(1).is_show {
  border: 2px solid #94ad73;
}
.tab_main:nth-child(2).is_show {
  border: 2px solid #e6de6b;
}
.tab_main:nth-child(3).is_show {
  border: 2px solid #e8a48b;
}

/*====================================================================
以下は不要です。
====================================================================*/
body {
  font-family: YuGothic, "游ゴシック体", "Yu Gothic", "ヒラギノ角ゴ Pro", "Hiragino Kaku Gothic Pro", "メイリオ", Meiryo, "ＭＳ Ｐゴシック", "MS PGothic", sans-serif;
  font-size: 16px;
  letter-spacing: .025em;
  line-height: 1.8;
  margin: 0;
}
@media screen and (max-width: 1024px) {
  body {
    font-size: 14px;
  }
}
.section {
  max-width: 1024px;
  margin: 0 auto;
  padding: 20px 20px 500px;
}
.section p._a {
  font-size: 12px;
  font-weight: bold;
  margin: 30px 0 0;
}
.section p._a .link {
  display: inline-block;
  color: #607D8B;
  padding-left: 1.3em;
  text-indent: -1.3em;
}
.section p._a .link:before {
  content: '';
  display: inline-block;
  width: 5px;
  height: 5px;
  border-top: 2px solid #607D8B;
  border-right: 2px solid #607D8B;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  margin-right: 10px;
}
!

JS 

              
                var TabList = function(elParent,contentsParent) {
  this.elParent = $(elParent);
  this.el = this.elParent.find('.one_tab');
  this.contentsParent = $(contentsParent);
  this.contents = this.contentsParent.find('.tab_main');
};
TabList.prototype.fn = function() {
  var that = this;
  this.el.on('click', function() {
    var index = $(this).index();
    that.elParent.each(function(){
      $('.one_tab',this).removeClass('select').eq(index).addClass('select');
    });
    that.contents.removeClass('is_show').eq(index).addClass('is_show');
  });
};
var syncTab = new TabList('.tabBox', '.contents');
syncTab.fn();
!
999px

Console