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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <h1>Static grid "tic-tac-toe-like".</h1>
<p>This grid is "static", uses a lot of classes to adapt the :before and :after pseudo elements depending on the position of each item.<br />
    Please visit this <a href="https://codepen.io/mcbenny/pen/EbEOvX" target="_top">automatic grid</a>, much better, that uses SCSS functions and variables.</p>
<div class="ttt" id="tic-tac-toe">
    <div class="ttt__box ttt__box--left">1</div>
    <div class="ttt__box">2</div>
    <div class="ttt__box ttt__box--right">3</div>
    <div class="ttt__box ttt__box--left">4</div>
    <div class="ttt__box">5</div>
    <div class="ttt__box ttt__box--right">6</div>
    <div class="ttt__box ttt__box--left ttt__box--bottom">7</div>
    <div class="ttt__box ttt__box--bottom">8</div>
    <div class="ttt__box ttt__box--bottom">9</div>
My "Proposition" for a tic-tac-toe-like grid...
              .ttt {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
    margin: 10vh auto;
    width: 80vh;
    height: 80vh;
    &__box {
        display: flex;
        justify-content: center;
        align-items: center;
        position: relative;
        height: 100%;
        text-align: center;
        &:not(&--left)::before {
            display: block;
            position: absolute;
            left: 0;
            border-left: 1px solid #000;
            width: 0;
            height: 100%;
            content: '';
        &:not(&--bottom)::after {
            display: block;
            position: absolute;
            bottom: 0;
            left: 0;
            border-bottom: 1px solid #000;
            width: 100%;
            height: 0;
            content: '';

     General appearance, nothing related to what you see ;-)
* {
     box-model: border-box;
body {
     line-height: 1.2em;
     font-family: "Segoe UI", sans-serif;
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