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HTML 

              
                <div class="accordian accordian--horizontal">
  <div class="accordian__item active">
    <h1 class="accordian__heading"><span class="arrow-right"></span>Day One</h1>
    <div class="accordian__body">
      <h3 class="text-left">Sunday&nbsp; <small class="text-right text-muted lead">April 6, 2019</small></h3>
      <div class="w-100"></div>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut blanditiis ex suscipit odio accusantium debitis, alias reiciendis ea dolore amet beatae quia est, vitae dolorem. Totam aliquid accusantium id qui. Lorem ipsum dolor sit amet, consectetur
        adipisicing elit. Sit at dolorem sint! Recusandae voluptas ducimus architecto earum iure et aliquam, non velit accusamus, illo voluptate, dolore eos in vitae nihil!</p>
      <div class="row text-center justify-content-around mt-4">
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 sunset" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Daytime dress</strong> <br /><b class="aqua">Travel Attire</b></p>
        </div>
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 jazzberry" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Evening dress</strong> <br /><b class="aqua">Resort Casual</b></p>
        </div>
      </div>
    </div>
  </div>
  <div class="accordian__item">
    <h1 class="accordian__heading"><span class="arrow-right"></span>Day Two</h1>
    <div class="accordian__body animated fadeIn">
      <h3 class="text-left">Monday&nbsp; <small class="text-right text-muted lead">April 7, 2019</small></h3>
      <div class="w-100"></div>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut blanditiis ex suscipit odio accusantium debitis, alias reiciendis ea dolore amet beatae quia est, vitae dolorem. Totam aliquid accusantium id qui. Lorem ipsum dolor sit amet, consectetur
        adipisicing elit. Sit at dolorem sint! Recusandae voluptas ducimus architecto earum iure et aliquam, non velit accusamus, illo voluptate, dolore eos in vitae nihil!</p>
      <div class="row text-center justify-content-around mt-4">
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 sunset" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Daytime dress</strong> <br /><b class="aqua">Resort Casual</b></p>
        </div>
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 jazzberry" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Evening dress</strong> <br /><b class="aqua">Resort Attire</b></p>
        </div>
      </div>
    </div>
  </div>
  <div class="accordian__item">
    <h1 class="accordian__heading"><span class="arrow-right"></span>Day Three</h1>
    <div class="accordian__body">
      <h3 class="text-left">Tuesday&nbsp; <small class="text-right text-muted lead">April 8, 2019</small></h3>
      <div class="w-100"></div>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut blanditiis ex suscipit odio accusantium debitis, alias reiciendis ea dolore amet beatae quia est, vitae dolorem. Totam aliquid accusantium id qui. Lorem ipsum dolor sit amet, consectetur
        adipisicing elit. Sit at dolorem sint! Recusandae voluptas ducimus architecto earum iure et aliquam, non velit accusamus, illo voluptate, dolore eos in vitae nihil!</p>
      <div class="row text-center justify-content-around mt-4">
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 sunset" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Daytime dress</strong> <br /><b class="aqua">Resort Casual</b></p>
        </div>
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 jazzberry" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Evening dress</strong> <br /><b class="aqua">Resort Elegant</b></p>
        </div>
      </div>
    </div>
  </div>
  <div class="accordian__item">
    <h1 class="accordian__heading"><span class="arrow-right"></span>Day Four</h1>
    <div class="accordian__body">
      <h3 class="text-left">Wednesday&nbsp; <small class="text-right text-muted lead">April 9, 2019</small></h3>
      <div class="w-100"></div>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut blanditiis ex suscipit odio accusantium debitis, alias reiciendis ea dolore amet beatae quia est, vitae dolorem. Totam aliquid accusantium id qui. Lorem ipsum dolor sit amet, consectetur
        adipisicing elit. Sit at dolorem sint! Recusandae voluptas ducimus architecto earum iure et aliquam, non velit accusamus, illo voluptate, dolore eos in vitae nihil!</p>
      <div class="row text-center justify-content-around mt-4">
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 sunset" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Daytime dress</strong> <br /><b class="aqua">Resort Casual</b></p>
        </div>
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 jazzberry" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Evening dress</strong> <br /><b class="aqua">Resort Attire</b></p>
        </div>
      </div>
    </div>
  </div>
  <div class="accordian__item">
    <h1 class="accordian__heading"><span class="arrow-right"></span>Day Five</h1>
    <div class="accordian__body">
      <h3 class="text-left">Thursday&nbsp; <small class="text-right text-muted lead">April 10, 2019</small></h3>
      <div class="w-100"></div>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Aut blanditiis ex suscipit odio accusantium debitis, alias reiciendis ea dolore amet beatae quia est, vitae dolorem. Totam aliquid accusantium id qui. Lorem ipsum dolor sit amet, consectetur
        adipisicing elit. Sit at dolorem sint! Recusandae voluptas ducimus architecto earum iure et aliquam, non velit accusamus, illo voluptate, dolore eos in vitae nihil!</p>
      <div class="row text-center justify-content-around mt-4">
        <div class="col-md-6">
          <i class="fas fa-user-circle mt-1 sunset" data-fa-transform="grow-20"></i>
          <p class="mt-3"><strong>Daytime dress</strong> <br /><b class="aqua">Travel Attire</b></p>
        </div>
      </div>
    </div>
  </div>
</div>
!

CSS 

              
                $aqua: #62cbc9;
$obsidian: #443635;
$sunset: #E07C00;
$jazzberry: #AA0061;
$white: #ffffff;
$base-font-size: 16px;
$base-font-family: sans-serif;

.aqua {color:$aqua;}
.jazzberry {color: $jazzberry;}
.sunset {color: $sunset;}
h3 {color: $obsidian;}

.accordian {
  display: flex;
  height: 400px;
  max-width: 600px;
  font-size: $base-font-size * 0.9;

  &--horizontal {
    .accordian {
      &__item {
        width: 50px;
        display: flex;
        position: relative;
        border-top: 2px $aqua solid;
        border-bottom: 2px $aqua solid;
        

        ul {
          list-style-type: none;
          
          li {
            margin: 0 0 15px 0;
            line-height: 1.2;
          }
        }

        &:last-of-type {
          border-right: 2px $aqua solid;
        }

        &:not(active) {
          border-left: 2px $white solid;
        }

        &:first-child {
          border-left: none;
        }
      }

      &__heading {
        color: $white;
        max-width: 60px;
        height: 100%;
        writing-mode: vertical-lr;
        margin: 0px;
        cursor: pointer;
      }

      &__body {
        min-width: calc(590px - 272px);
        overflow: hidden;
        color: $obsidian;
      }
    }
  }

  &__item {
    flex-grow: 0;
    transition: flex-grow 0.25s ease-in;
    overflow: hidden;
    background-color: $white;

    &.active {
      flex-grow: 1;
    }
  }

  &__heading {
    font-family: $base-font-family;
    font-size: 1.8rem;
    line-height: 0.75;
    padding: 1rem;
    background-color: $aqua;
  }

  &__body {
    padding: 1rem;
    color: $white;
  }
}
!

JS 

              
                $(".accordian__item").on("click", function() {
  $(this)
    .addClass("active")
    .siblings()
    .removeClass("active");
});
!
999px

Console