JSFiddle - React, Tailwind, and code Playground

by rough cheap

HTML

<ul>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
  <li>5</li>
  <li>6</li>
  <li>7</li>
  <li>8</li>
  <li>9</li>
  <li>10</li>
  <li>11</li>
  <li>12</li>
  <li>13</li>
  <li>14</li>
  <li>15</li>
  <li>16</li>
</ul>
<div class="totp">
  <div class="site">Nextcloud ([email protected]...</div>
  <div class="otp">544 738</div>
</div>

CSS

ul {
  display: flex;
  list-style: none;
}

li {
  width: 32px;
  height: 36px;
  background-color: blue;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  margin-right: 7px;
}

li:nth-child(3n) {
  background-color: red;
}

li:nth-child(2n) {
  background-color: magenta;
}

li:nth-child(3n):not(:nth-child(2n)) {
  background-color: green;
}

.totp {
  margin-top: 48px;
  width: 689px;
}

.site {
  font-size:36px;
}

.otp {
  position: relative;
  font-size: 64px;
  color: blue;
}

.otp::before {
  position: absolute;
  content: "";
  width: 0;
  height: 0;
  border-radius: 50%;
  border-left: 20px solid blue;
  border-right: 20px solid transparent;
  border-top: 20px solid blue;
  border-bottom: 20px solid transparent;
  top: 50%;
  right: 20px;
  transform: translateY(-50%) rotate(-45deg);
  transform-origin: 50% 50%;
}

.otp::after {
  position: absolute;
  content: "";
  width: 0;
  height: 0;
  border-radius: 50%;
  border-left: 20px solid transparent;
  border-right: 20px solid blue;
  border-top: 20px solid transparent;
  border-bottom: 20px solid blue;
  top: 50%;
  right: 20px;
  transform: translateY(-50%) rotate(-15deg);
  transform-origin: 50% 50%;
}