JSFiddle - React, Tailwind, and code Playground

HTML

<span class="caretdown"></span>

CSS

.caretdown {
    border-bottom: 10px solid #000000;
    border-left: 6px solid rgba(0, 0, 0, 0);
    border-right: 6px solid rgba(0, 0, 0, 0);
    content: "";
    display: inline-block;
    height: 0;
    vertical-align: top;
    width: 0;
}