JSFiddle - React, Tailwind, and code Playground

by Shanna Barnard

HTML

<div class="box">
    <div class="box_bg">   
        <div class="corner one"></div>
        <div class="corner two"></div>
    </div>
</div>

CSS

.box {
   -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
     -ms-transform: rotate(-45deg);
      -o-transform: rotate(-45deg);
          margin-top:-50px;
}

.box_bg {
    background: red;
    height: 300px;
    width: 300px;
    margin: 100px;
   -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
     -ms-transform: rotate(45deg);
      -o-transform: rotate(45deg);
    -moz-border-radius: 20%;
     -webkit-border-radius: 20%;
      border-radius: 20%;
}

.box_bg:before {
    content: " ";
    position: absolute;
    width: 40px;
    height: 40px;
    background-color: #fff;
    border-radius: 20px;
 }

.corner {
      display: inline-block;
      width: 0;
      height: 0;
      border-left: 0 solid transparent;
      border-right: 70px solid transparent;
      border-top: 100px solid red;
      -moz-border-radius: 50%;
      -webkit-border-radius: 50%;
      border-radius: 50%;
      float: left;
      margin-left: 15px;
}

.one {
   -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
     -ms-transform: rotate(0deg);
      -o-transform: rotate(0deg);
}

.two {
   margin-left: -70px;
   -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
     -ms-transform: rotate(-90deg);
      -o-transform: rotate(-90deg);
}