JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container1">
  <div class="box">Box 2</div>
  <div class="box">Box 3</div>
  <div class="box">Box 4</div>
  <div class="box">Box 5</div>
</div>

<div class="container">
  <div class="bigbox">Box 1</div>
  <div class="box">Box 6</div>
  <div class="box">Box 7</div>
  <div class="widebox">Box 8</div>
  <div class="box">Box 9</div>
  <div class="box">Box 10</div>
  <div class="box">Box 11</div>
  <div class="box">Box 12</div>
  <div class="box">Box 13</div>
  <div class="box">Box 14</div>
  <div class="box">Box 15</div>
  <div class="box">Box 16</div>
  <div class="box">Box 17</div>
  <div class="box">Box 18</div>
  <div class="box">Box 19</div>
</div>

CSS

#container1 {
  width: 220px;
  height: 215px;
   float: left;
}

.box, .bigbox, .widebox {
  background-color: olive;
  width: 100px;
  height: 100px;
  margin: 5px;
  float: left;
}

.bigbox {
  background-color: olive;
  width: 210px;
  height: 210px;
    float: left;
}

.widebox {
  background-color: olive;
  width: 210px;
  height: 100px;
}