JSFiddle - React, Tailwind, and code Playground

HTML

<div id="search">
    <input type="submit" class="circle-search-button" value="" />
</div>

CSS

input.header-search {
    background:#F2F2F2;
    border:none;
    color:#000;
}
#search {
    position:relative;
}
.circle-search-button {
    width: 15%;
    height:0;
    padding-bottom: 15%;
    -moz-border-radius: 50%;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    background: #ccc;
    position:absolute;
    top:0;
    left:10px;
    border:none;
}