JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<head>
    <meta charset="utf-8">    

</head>
<body>
  <div id="wrapper">
    <div id="myDiv1" class="mydiv"></div>
    <div id="myDiv2" class="mydiv"></div>
    <div id="myDiv3" class="mydiv"></div>
    <div id="myDiv4" class="mydiv"></div>
    <div id="myDiv5" class="mydiv"></div>
    <div id="myDiv6" class="mydiv"></div>
  </div>
</body>
</html>

CSS

body {
  background: #EEE;
  font-family: arial, helvetica, sans-serif;
  margin: 0;
  padding: 0;
}

#wrapper {
  width: 960px;
  margin: 0 auto;
}

.mydiv {
  margin: 60px auto;
  width: 400px;
  height: 400px;
  background-color: #ff9900;
}

#myDiv1 {
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
}


#myDiv2 {
  -webkit-border-top-left-radius: 50px;
  -webkit-border-bottom-right-radius: 50px;
  -moz-border-radius-topleft: 50px;
  -moz-border-radius-bottomright: 50px;
}


#myDiv3 {
  -webkit-border-radius: 5px 200px 30px 50px;
  -moz-border-radius: 5px 200px 30px 50px;
}


#myDiv4 {
  -webkit-border-radius: 100px / 30px;
  -moz-border-radius: 100px / 30px;
}


#myDiv5 {
  -webkit-border-radius: 300px;
  -moz-border-radius: 300px;
}


#myDiv6 {
  border-radius: 50px;
}