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                  <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 class="item item31">31</div>
    <div class="item item32">32</div>
    <div class="item item33">33</div>
    <div class="item item34">34</div>
    <div class="item item35">35</div>
    <div class="item item36">36</div>
    <div class="item item37">37</div>
    <div class="item item38">38</div>
    <div class="item item39">39</div>
    <div class="item item40">40</div>
    <div class="item item41">41</div>
    <div class="item item42">42</div>



                .container {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  grid-gap: 10px;

.item {
  padding:4px 20px;
  font-size: 26px;
  line-height: 40px;
  color: #fff;
  text-align: center;
  font-family: 'Open Sans', sans-serif;
  background: cornflowerblue;

.item3 {
  grid-column-start: 2;
  grid-column-end: 5;
  grid-row-start: 2;
  grid-row-end: 7;
.item4 {
  grid-column-start: 6;
  grid-column-end: 10;
  grid-row-start: 2;
  grid-row-end: 3;
.item5 {
  grid-column-start: 6;
  grid-column-end: 10;
  grid-row-start: 4;
  grid-row-end: 7;