Vue-multiselect

Example fiddle for issue reproduction usage

HTML

<script src="https://unpkg.com/[email protected]/dist/vue-multiselect.min.js"></script>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/vue-multiselect.min.css">
<div id="app">
  <multiselect 
    v-model="value" 
    :options="options"
    :multiple="true"
    track-by="library"
    :custom-label="customLabel"
    >
  </multiselect>
  <multiselect 
    v-model="value" 
    :options="options"
    :multiple="true"
    track-by="library"
    :custom-label="customLabel"
    >
  </multiselect>
  <div class="lower-z-index">This should be under multiselect content.</div>
</div>

CSS

* {
  font-family: 'Lato', 'Avenir', sans-serif;
}

.lower-z-index {
  position: relative;
  color: red;
  z-index: 5;
}
.multiselect__content-wrapper {
  z-index: 6;
}
.multiselect--active {
  z-index: 10;
}

Babel + JSX

new Vue({
	components: {
  	Multiselect: window.VueMultiselect.default
	},
	data: {
  	value: [{ language: 'JavaScript', library: 'Vue-Multiselect' }],
  	options: [
    	{	language: 'JavaScript', library: 'Vue.js' },
      { language: 'JavaScript', library: 'Vue-Multiselect' },
      { language: 'JavaScript', library: 'Vuelidate' }
    ]
	},
  methods: {
  	customLabel (option) {
      return `${option.library} - ${option.language}`
    }
  }
}).$mount('#app')