JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<article class="alert-box" id="alert-box-news">
  <h1>News Alerts</h1>
  <p>text text text text text text text text text text text text text text</p>
  <a class="alert-box-close" id="close-alert-box-news">
    <img src="http://i.imgur.com/czf8yas.png" height="25" width="25" alt="">
  </a>
</article>

<article class="alert-box" id="alert-box-maintenance">
  <h1>Site Maintenance</h1>
  <p>text text text text text text text text text text text text text text</p>
  <a class="alert-box-close" id="close-alert-box-maintenance">
    <img src="http://i.imgur.com/czf8yas.png" height="25" width="25" alt="">
  </a>
</article>

CSS

.alert-box {
  width: 50vw;
  position: relative;
  margin: 20px auto;
  border: 1px solid black;
}

.alert-box-close {
  position: absolute;
  top: -12px;
  right: -12px;
  cursor: pointer;
}

JavaScript

$(document).ready(function() {
var currentTime = new Date().getTime();
var timeAfter24 = currentTime + 12*60*60*1000;
  $("#close-alert-box-news").click(function() {
    $("#alert-box-news").hide(800);
    //Set desired time till you want to hide that div
    localStorage.setItem('desiredTime', timeAfter24); 
  });
  if(localStorage.getItem('desiredTime') >= currentTime)
  {
    $('#alert-box-news').hide();
  }else{
    $('#alert-box-news').show();
  }
  
  
  $("#close-alert-box-maintenance").click(function() {
    $("#alert-box-maintenance").hide(800);
    //Set desired time till you want to hide that div
    localStorage.setItem('desiredTime1', timeAfter24); 
  });
  if(localStorage.getItem('desiredTime1') >= currentTime)
  {
    $('#alert-box-maintenance').hide();
  }else{
    $('#alert-box-maintenance').show();
  }
 
});