Manage Overlays with Vue 3 Teleport

// components/ModalComponent.vue
<template>
  <teleport to="body">
    <div v-if="isOpen" class="modal-backdrop" @click.self="closeModal">
      <div class="modal-content">
        <header class="modal-header">
          <h3>{{ title }}</h3>
          <button @click="closeModal" class="close-button">&times;</button>
        </header>
        <div class="modal-body">
          <slot>Default modal content.</slot>
        </div>
        <footer class="modal-footer">
          <slot name="footer">
            <button @click="closeModal">Close</button>
          </slot>
        </footer>
      </div>
    </div>
  </teleport>
</template>

<script setup>
import { defineProps, defineEmits } from 'vue';

const props = defineProps({
  isOpen: {
    type: Boolean,
    default: false,
  },
  title: {
    type: String,
    default: 'Modal Title',
  },
});

const emit = defineEmits(['close']);

const closeModal = () => {
  emit('close');
};
</script>

<style scoped>
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background-color: white;
  padding: 20px;
  border-radius: 8px;
  min-width: 300px;
  max-width: 80%;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  position: relative;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  border-bottom: 1px solid #eee;
  padding-bottom: 10px;
}

.close-button {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-footer {
  border-top: 1px solid #eee;
  padding-top: 10px;
  margin-top: 15px;
  display: flex;
  justify-content: flex-end;
}
</style>

// App.vue
<template>
  <div>
    <h1>My App Content</h1>
    <button @click="showModal = true">Open Modal</button>

    <ModalComponent :is-open="showModal" title="Important Notification" @close="showModal = false">
      <p>This content is rendered inside the modal body.</p>
      <p>Even though the modal component is nested here, its content is teleported to the body!</p>
      <template #footer>
        <button @click="showModal = false" style="background-color: #007bff; color: white; border: none; padding: 8px 15px; border-radius: 4px; cursor: pointer;">
          Confirm
        </button>
      </template>
    </ModalComponent>
  </div>
</template>

<script setup>
import { ref } from 'vue';
import ModalComponent from './components/ModalComponent.vue';

const showModal = ref(false);
</script>