JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="container">
<div >
<input type="button" value="load button">
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>
<p>background contents background contents background contents</p>  
</div>
</div>



    
    <div class="loadingContainer">
    <div id="divLoading3">
      <div id="loader-wrapper">
        <div id="loader"></div>
      </div>
    </div>
  </div>

CSS

.loadingContainer {
    width: 50%;
    height: 50%;
    overflow: auto;
    margin: auto;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

.shader {
    width: 100%;
    height: 100%;
    background-color: black;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    position: fixed;
    opacity: 0.5;
    display: none;
}

#divLoading3 {
    border-radius: 40px;
    margin: auto;
    overflow: hidden;
    width: 100%;
    height: 100%;
    background-color: white;
}

#loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
}

#loader {
    display: block;
    position: relative;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #3498db;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

#loader:before {
    content:"";
    position: absolute;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #e74c3c;
    -webkit-animation: spin 3s linear infinite;
    animation: spin 3s linear infinite;
}

#loader:after {
    content:"";
    position: absolute;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #f9c922;
    -webkit-animation: spin 1.5s linear infinite;
    animation: spin 1.5s linear infinite;
}

JavaScript

$(".loadingContainer").hide();
$('input[type=button]').click(function() {
  $(".loadingContainer").fadeIn();
    $('.container').css({opacity:'0.5'})
});