JSFiddle - React, Tailwind, and code Playground

HTML

<div class="half under"><div class="item i1">1</div></div>
<div class="half above"><div class="item i1">1</div></div>
<div class="item i2">2</div>
<div class="item i3">3</div>
<div class="item i4">4</div> 
<div class="item i5">5</div>

CSS

.item {
    width: 50px;
    height: 50px;
    line-height: 50px;
    border: 1px solid red;
    background: silver;
    border-radius: 50%;
    text-align: center;
}
.half {
    position: absolute;
    overflow: hidden;
    width: 52px;
    height: 26px;
    line-height: 52px;
    text-align: center;
}
.half.under {
    top: 30px; 
    left: 0px;
    z-index: -1;
    border-radius: 90px 90px 0 0;
}
.half.above {
     top: 55px;
    left: 0px;
    z-index: 1;
    border-radius: 0 0 90px 90px;
}
.half.above .i1 { margin-top:-50%; }
.i2 { position: absolute; top: 0px; left: 35px;}
.i3 { position: absolute; top: 30px; left: 65px;}
.i4 { position: absolute; top: 70px; left: 50px; }
.i5 { position: absolute; top: 70px; left: 15px; }