Separated tab-switcher into a reusable component. This depends on JSX addition

src/components/tab_switcher/tab_switcher.jsx

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+import Vue from 'vue'
+
+import './tab_switcher.scss'
+
+export default Vue.component('tab-switcher', {
+  name: 'TabSwitcher',
+  data () {
+    return {
+      active: 0
+    }
+  },
+  methods: {
+    activateTab(index) {
+      return () => this.active = index;
+    }
+  },
+  render(h) {
+    const tabs = this.$slots.default
+          .filter(slot => slot.data)
+          .map((slot, index) => {
+            const classes = ['tab']
+
+            if (index === this.active) {
+              classes.push('active')
+            }
+            return (<button onClick={this.activateTab(index)} class={ classes.join(' ') }>{slot.data.attrs.title}</button>)
+          });
+    const contents = (
+      <div>
+        {this.$slots.default.filter(slot => slot.data)[this.active]}
+      </div>
+    );
+    return (
+      <div class="tab-switcher">
+        <div class="tabs">
+          {tabs}
+        </div>
+        <div class="contents">
+          {contents}
+        </div>
+      </div>
+    )
+  }
+})

src/components/tab_switcher/tab_switcher.scss

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+@import '../../_variables.scss';
+
+.tab-switcher {
+  .tabs {
+    display: flex;
+    position: relative;
+    justify-content: center;
+    width: 100%;
+    overflow: hidden;
+    padding-top: 5px;
+
+    &::after, &::before {
+      display: block;
+      content: '';
+      flex: 1 1 auto;
+    }
+
+    .tab, &::after, &::before {
+      border-bottom: 1px solid;
+      border-bottom-color: $fallback--btn;
+      border-bottom-color: var(--btn, $fallback--btn);
+    }
+
+    .tab {
+      border-bottom-left-radius: 0;
+      border-bottom-right-radius: 0;
+      padding: .3em 1em;
+
+      &::-moz-focus-inner {
+        border: none;
+      }
+
+      &:not(.active) {
+        border-bottom: 1px solid;
+        border-bottom-color: $fallback--btn;
+        border-bottom-color: var(--btn, $fallback--btn);
+        z-index: 4;
+      }
+
+      &.active {
+        background: transparent;
+        border-bottom: none;
+        z-index: 5;
+      }
+    }
+  }
+}