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HTML

Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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CSS

CSS Base

About CSS Base

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Vue 

              
                <template>
  <aside 
         class="sidebar"
         @click="activeItem=0"
         >
          <div class="logo"><svg viewBox="0 0 89 59" width="89" height="59" xmlns="http://www.w3.org/2000/svg"><path d="M59.258 58.406H0V.594h59.258L88.164 29.5 59.258 58.406zM78.086 29.5L55.898 7.312H6.758v44.336h49.14L78.086 29.5zm-42.422 4.766L23.086 46.844l-4.766-4.766L30.898 29.5 18.32 16.922l4.766-4.766 12.578 12.578 12.578-12.578 4.766 4.766L40.43 29.5l12.578 12.578-4.766 4.766-12.578-12.578z" fill="currentColor" fill-rule="nonzero"></path></svg></div>
    
    <fieldset>
      <legend>Columns ({{itemNum}})</legend>
      <input type="range" v-model="itemNum" min="2" max="25" step="1"/>
    </fieldset>
    
    <fieldset>
      <legend>Hover displace ({{itemHoverDisplace}}%)</legend>
      <input type="range" v-model="itemHoverDisplace" min="0" max="10" step=".5"/>
    </fieldset>
    
    <fieldset>
      <legend>Collapsed size ({{itemTranslateCollapsed}}%)</legend>
      <input type="range" v-model="itemTranslateCollapsed" min="0" max="20" step="1"/>
    </fieldset>
    
  </aside>
  <main class="accordion" 
        :style="{
                '--item-num': parseInt(itemNum), 
                '--hover-displace': `${itemHoverDisplace}%`,
                '--item-translate-collapsed': `${itemTranslateCollapsed}%`,
                '--item-translate': 'calc(100% / var(--item-num))'
                }"
        :class="activeItem > 0 && 'accordion--open'"
        >
    <div 
         class="accordion__item"
         v-for="index in parseInt(itemNum)" 
         :key="index"
         :style="`--index: ${index}; background-color: #${colors[index]}`"
         :class="index === activeItem && 'accordion__item--open'"
         @click="activeItem=index"
         >
      <div class="accordion__item__content"><h1>Item {{index}}</h1>
      <h3>Straight text</h3>
      <p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. Nam liber tempor cum soluta nobis eleifend option congue nihil imperdiet doming id quod mazim placerat facer possim assum. Typi non habent claritatem insitam; est usus legentis in iis qui facit eorum claritatem. Investigationes demonstraverunt lectores legere me lius quod ii legunt saepius. Claritas est etiam processus dynamicus, qui sequitur mutationem consuetudium lectorum. Mirum est notare quam littera gothica, quam nunc putamus parum claram, anteposuerit litterarum formas humanitatis per seacula quarta decima et quinta decima. Eodem modo typi, qui nunc nobis videntur parum clari, fiant sollemnes in futurum.</p></div>
         </div>
  </main>
</template>

<script setup>
  import { computed, ref,watch } from "vue"
  
  const itemNum = ref(5);
  const itemHoverDisplace = ref(1);
  const itemTranslateCollapsed = ref(4);
  const activeItem = ref(0);
  const colors = [...Array(100).keys()].map((i) => Math.floor(Math.random() * 16777215).toString(16))
  
  
</script>

<style lang="scss">
  
  .accordion {
    flex: 1;
    background: silver;
    height: 100%;
    --item-translate-collapsed: 4%;
    --hover-displace: 1%;
    
    &--open {
      	--item-translate: var(--item-translate-collapsed)!important;
    }
    
    &__item {
      
      $item: &;
      
      position: absolute;
      z-index: var(--index, 1);
      overflow: hidden;
      height: 100%;
      padding: 1rem;
      box-shadow: 0 0 2rem rgba(0 0 0 / 50%);
      background: maroon;
      
      transform: translateX(calc(var(--item-translate) * (var(--index) - 1)));
      transition: transform .4s;
      
      &:not(#{$item}--open):hover {
        cursor: pointer;
        transform: translate(calc(var(--item-translate) * (var(--index) - 1) - var(--hover-displace)));
      }
      
      &--open ~ #{$item} {
	      transform: translate(calc(100% - ((var(--item-num) - var(--index) + 1) * var(--item-translate-collapsed))));
        &:hover {
         transform: translate(calc(100% - ((var(--item-num) - var(--index) + 1) * var(--item-translate-collapsed)) - var(--hover-displace)));
        }
      }
      
      &__content {
        margin-inline-end: calc((var(--item-num) - 1) * var(--item-translate-collapsed));
      }
    }
  }
  
  .sidebar {
    background: white;
  }
  
  .logo {
    background: black;
    color: white;
    aspect-ratio: 1;
    border-radius: 50%;
    padding: .5rem;
    margin: 2rem 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    max-width: 60px;
    svg { max-width: 70%; transform: translateX(8%); }
  }
  
  fieldset {
    display: flex;
    margin: 1rem;
    
    button { 
      flex: 1;
      margin: .2rem;
    }
  }
  
  #app {
    font-family: Avenir, Helvetica, Arial, sans-serif;
    color: #2c3e50;
    height: 100%;
    display: flex;
  }
  
  html, body, #app {
    height: 100%;
    overflow: hidden;
  }
  
</style>
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