<div class="container">
  <div class="item item1">1</div>
  <div class="item item2">2</div>
  <div class="item item3">3</div>
  <div class="item item4">4</div>
  <div class="item item5">5</div>
  <div class="item item6">6</div>
  <div class="item item7">7</div>
  <div class="item item8">8</div>
  <div class="item item9">9</div>
  <div class="item item10">10</div>
  <div class="item item11">11</div>
  <div class="item item12">12</div>
  <div class="item item13">13</div>
  <div class="item item14">14</div>
  <div class="item item15">15</div>
  <div class="item item16">16</div>
  <div class="item item17">17</div>
  <div class="item item18">18</div>
  <div class="item item19">19</div>
  <div class="item item20">20</div>
  <div class="item item21">21</div>
  <div class="item item22">22</div>
  <div class="item item23">23</div>
  <div class="item item24">24</div>
  <div class="item item25">25</div>
  <div class="item item26">26</div>
  <div class="item item27">27</div>
  <div class="item item28">28</div>
  <div class="item item29">29</div>
  <div class="item item30">30</div>
</div>
:root {
  --yellow: #ffc600;
}

.container {
  display: grid;
  grid-gap: 20px;
  grid-template-columns: repeat(5, 1fr);
}

.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;
}

.item2 {
  background: #BADA55;
  grid-column-start: 2;
  grid-column-end: 5;
}
.item5 {
  background: #BADA55;
  grid-column: 3 / 4;
}
.item7 {
  background: #BADA55;
  grid-column: 2 / span 2;
}
.item10 {
  background: #BADA55;
  grid-column: 1 / -1;
}

External CSS

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External JavaScript

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