<div class="container">
  <div class="itm itm1">1</div>
  <div class="itm itm2">2</div>
  <div class="itm itm3">3</div>
  <div class="itm itm4">4</div>
  <div class="itm itm5">5</div>
  <div class="itm itm6">6</div>
  <div class="itm itm7">7</div>
  <div class="itm itm8">8</div>
  <div class="itm itm9">9</div>
  <div class="itm itm10">10</div>
  <div class="itm itm11">11</div>
  <div class="itm itm12">12</div>
  <div class="itm itm13">13</div>
  <div class="itm itm14">14</div>
  <div class="itm itm15">15</div>
  <div class="itm itm16">16</div>
  <div class="itm itm17">17</div>
  <div class="itm itm18">18</div>
  <div class="itm itm19">19</div>
  <div class="itm itm20">20</div>
  <div class="itm itm21">21</div>
  <div class="itm itm22">22</div>
  <div class="itm itm23">23</div>
  <div class="itm itm24">24</div>
  <div class="itm itm25">25</div>
  <div class="itm itm26">26</div>
  <div class="itm itm27">27</div>
  <div class="itm itm28">28</div>
  <div class="itm itm29">29</div>
  <div class="itm itm30">30</div>
  <div class="itm itm31">31</div>
  <div class="itm itm32">32</div>
  <div class="itm itm33">33</div>
  <div class="itm itm34">34</div>
  <div class="itm itm35">35</div>
  <div class="itm itm36">36</div>
  <div class="itm itm37">37</div>
  <div class="itm itm38">38</div>
  <div class="itm itm39">39</div>
  <div class="itm itm40">40</div>
</div>
:root {
  --yellow: #ffc600;
}

.container {
  display: grid;
  grid-gap: 20px;
  grid-template-columns: repeat(5, 100px);
  grid-template-rows: repeat(5, 100px);
  place-items: stretch stretch;
  justify-content: center;
  align-content: center;
}

.itm {
  background: tomato;
}

.itm4 {
  background: greenyellow;
  align-self: center;
  justify-self: center;
}

.item {
  display: grid;
  justify-content: center;
  align-items: center;
  border: 5px solid rgba(0, 0, 0, 0.03);
  border-radius: 3px;
  font-size: 35px;
  background-color: var(--yellow);
}

.item p {
  margin: 0 0 5px 0;
}

External CSS

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External JavaScript

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