tethys/resources/js/components/ShowModal.vue

<template>
  <transition name="modal-fade">
    <div class="modal-backdrop">
      <div class="modal" role="dialog" aria-labelledby="modalTitle" aria-describedby="modalDescription">
        <header class="modal-header" id="modalTitle">
          <slot name="header">
            This is the default tile!
            <button type="button" class="btn-close" v-on:click="close" aria-label="Close modal">x</button>
          </slot>
        </header>
        <section class="modal-body" id="modalDescription">
          <slot name="body">I'm the default body!</slot>
        </section>
        <footer class="modal-footer">
          <slot name="footer">            
            <button type="button" class="btn-green" v-on:click="close" aria-label="Close modal">Close me!</button>
          </slot>
        </footer>
      </div>
    </div>
  </transition>
</template>


<script>
// https://alligator.io/vuejs/vue-modal-component/
import { Component, Vue } from "vue-property-decorator";

@Component({})
export default class Modal extends Vue {  
    close() {     
      this.$emit("close");
    } 
}

</script>

<style>
.modal-backdrop {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right:0;
  background-color: rgba(0, 0, 0, 0.3);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1001;
}

.modal {
  background: #ffffff;
  box-shadow: 2px 2px 20px 1px;
  overflow-x: auto;
  display: flex;
  flex-direction: column;
  width: 80%;
}

.modal-header,
.modal-footer {
  padding: 15px;
  display: flex;
}

.modal-header {
  border-bottom: 1px solid #eeeeee;
  color: #4aae9b;
  justify-content: space-between;
}

.modal-footer {
  border-top: 1px solid #eeeeee;
  justify-content: flex-end;
}

.modal-body {
  position: relative;
  padding: 20px 10px;
}

.btn-close {
  border: none;
  font-size: 20px;
  padding: 20px;
  cursor: pointer;
  font-weight: bold;
  color: #4aae9b;
  background: transparent;
}

.btn-green {
  color: white;
  background: #4aae9b;
  border: 1px solid #4aae9b;
  border-radius: 2px;
}
</style>