JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block1">
<div class="lang"></div>
</div>
<div class="block2">

</div>

CSS

.block1{
  background:#ccc;
  position: relative;
  width: 100%;
  height:300px;
}
.lang{
    width: 50px;
    height: 50px;
    background: #ccc;
    border-radius: 50%;
    position: absolute;
    bottom: -23px;
    left: 50%;
    margin-left: -25px;
}
.lang:before{
content: " ";
    width: 20px;
    height: 20px;
    display: block;
    background: #ccc;
    position: absolute;
    left: -9px;
    top: 50%;
    margin-top: -15px;
    transform: rotate(37deg);
}
.lang:after{
    content: " ";
    width: 20px;
    height: 20px;
    display: block;
    background: #ccc;
    position: absolute;
    right: -9px;
    top: 50%;
    margin-top: -15px;
    transform: rotate(50deg);
}
.block2{
  background:#1a1a1a;
  width: 100%;
  height:300px;
}