JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modalContainer">
  <div class="modalContents">
    <h1>This is Modal 1</h1>
    <button>Go to Next</button>
  </div>
</div>

CSS

.modalContainer {
  width: 350px;
  height: 300px;
  box-shadow: 0px 28px 28px 9px rgba(0,0,0,0.30);
  margin: 0 auto;
  box-sizing: border-box;
  border-radius: 10px;
  text-align: center;
  padding: 20px;
  font-family: 'Montserrat'
}

button  {
  margin: 25px 22px 0;
  background-color: green;
  border: 0;
  padding: 13px 30px;
  color: white;
  font-family: Montserrat;
  font-style: normal;
  font-weight: bold;
  font-size: 17px;
  line-height: 21px;
  border-radius: 5px;  
}