JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div id="wrapper">
    <h1>Welcome</h1>
  </div>

  <div class="popupwindow animated tada">
    <p>Please confirm whatever...</p>
    <div class="buttonholder">
      <a href="#" class="button button-danger">Cancel</a>
      <a href="#" class="button">Submit</a>
    </div>
  </div>
  <script src="/javascript/jquery.js"></script>
  <script src="/javascript/blur.js"></script>
  <script src="/javascript/myScript.js"></script>
</body>

CSS

* {
  margin: 0px;
  padding: 0px;
  font-family: 'Montserrat', sans-serif;
}

body {
background-color: darkgrey;
}
#wrapper{
  width: 98%;
  height: 1200px;
  margin: auto;
  margin-top: 4px;
  padding: 5px;
  box-shadow: 10px 10px 5px #888888;
  text-align: center;

  background-repeat: no-repeat;
  background-position: top;
}

.popupwindow{
  height: 120px;
  width: 50%;
  margin: auto;
  color: white;
  left: 25%;
  top: 50%;
  position: absolute;
  border-radius: 8px;



}


.buttonholder {
  border: 1px solid white;
}


.button {
  display: block;
  background-color: rgb(14, 165, 240);
  width: 180px;
  margin: auto;
  
  line-height: 25px;
  font-family: 'Montserrat', sans-serif;
  float: left;
  height: 25px;
  text-decoration: none;
  border-radius: 7px;
  color: white;
  text-transform: uppercase;
  text-align: center;
  font-weight: bolder;
}

.button:hover{
  background-color: rgb(124, 208, 250);
}

.button-danger {
  background-color: rgb(224, 35, 35);
}

.button-danger:hover {
  background-color: rgb(230, 85, 85);
}