JSFiddle - React, Tailwind, and code Playground

HTML

<grid-item>A</grid-item>
<grid-item>B</grid-item>
<grid-item>C</grid-item>
<grid-item>D</grid-item>
<grid-item>E</grid-item>
<grid-item>F</grid-item>
<grid-item>A</grid-item>
<grid-item>B</grid-item>
<grid-item>C</grid-item>
<grid-item>D</grid-item>
<grid-item>E</grid-item>
<grid-item>F</grid-item>
<grid-item><div class="ribbon-wrapper"><div class="ribbon">NEW</div></div>PRO</grid-item>
<grid-item>B</grid-item>
<grid-item>C</grid-item>
<grid-item>D</grid-item>
<grid-item>E</grid-item>
<grid-item>F</grid-item>
<grid-item>A</grid-item>
<grid-item>B</grid-item>
<grid-item>C</grid-item>
<grid-item>D</grid-item>
<grid-item>E</grid-item>
<grid-item>F</grid-item>

SCSS

body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  grid-auto-rows: 1fr;
  grid-gap: 5px;
  height: 100vh;
  padding: 5px;
  margin: 0;
  box-sizing: border-box;
}

grid-item {
  background-color: lightgreen;
  display: flex;
  justify-content: center;
  align-items: center;
  
  position: relative;
  }
  
  
.ribbon-wrapper {
        overflow: hidden;
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
    }

    .ribbon-wrapper .ribbon {
        font: bold 15px sans-serif;
        color: #333;
        text-align: center;
        transform: rotate(-45deg);
        position: relative;
        padding: 7px 0;
        top: 15px;
        left: -30px;
        width: 15vw;
        background-color: #ebb134;
        color: #fff;
    }