JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
     <div class="fix"></div>
<div class="outer">
   
  <div class="inner"> 
    
  </div>
    
</div>
  
</div>
   <div class="red"></div>

CSS

body {
    background-color: #CCC;
}

.wrapper {
    
}

.outer {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 205px 32px 205px;
    border-color: transparent transparent #ffffff transparent;
    position: absolute;
}

.inner {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 200px 32px 200px;
    border-color: transparent transparent #ea2225 transparent;
    margin-left: -200px;
    margin-top: 5px;
    position: absolute;
}

.fix {
    background-color: #FFF;
    height: 10px;
    width: 410px;
    position: absolute;
    margin-top: 32px;
}

.red {
    width: 396px;
    height: 300px;
    background-color: #ea2225;
    margin-top: 37px;
    position: absolute;
    border-left: 7px solid #FFF;
    border-right: 7px solid #FFF;
    border-bottom: 6px solid #FFF;
-webkit-box-shadow: 3px 5px 5px 0px rgba(48,48,48,1);
-moz-box-shadow: 3px 5px 5px 0px rgba(48,48,48,1);
box-shadow: 3px 5px 5px 0px rgba(48,48,48,1);
}