JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <p>fffffffffffffffffffffffffffffffff</p>
</div>
<div>
    <p>fff ffff fffff fffff ffffff ffffff ffff</p>
</div>

CSS

/* css reset */

html, body, div, span, object, iframe, h1, h2, h3, h4, h5, h6,
p, blockquote, pre, a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong,
sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li,
fieldset, form, label, legend, table, caption, tbody, tfoot,
thead, tr, th, td, article, aside, canvas, details, embed, figure,
figcaption, footer, header, hgroup, menu, nav, output, ruby, section,
summary, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    vertical-align: baseline;
}

article, aside, details, figcaption, figure, footer, header, hgroup,
menu, nav, section {
    display: block;
}

body {
    line-height: 1.2;
}

ol {
    padding-left: 1.4em;
    list-style: decimal;
}

ul {
    padding-left: 1.4em;
    list-style: square;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

a {
    text-decoration: none;
    display: block;
}

div {
    width: 50px;
    border:  1px solid black;
    margin: 20px;
}

p {
  word-break: break-all;
  /***/
  overflow-wrap: break-word;
  word-wrap: break-word;
}