<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Parent Tab</title>
    <style type="text/css">
      .margin--top {
        margin-top: 20px;
      }
      .margin--half-left {
        margin-left: 10px;
      }
      .list-item {
        background: #efefef;
        padding: 20px;
      }
      .btn {
        min-width: 70px;
        height: 34px;
        background: #61bdff;
        border: 0;
        color: #fff;
        font-size: 15px;
      }
      .btn--success {
   