JSFiddle - React, Tailwind, and code Playground

HTML

<div id="mainContainer">
    <div id="leftContainer">
      <table style="width: 200px;">
        <tr>
          <td>Date</td>
          <td>New Users</td>    
          </tr>
        <tr>
          <td>April 3</td>
          <td>48</td>
        </tr>
        <tr>
          <td>April 4</td>
          <td>41</td>
        </tr>
        <tr>
          <td>April 5</td>
          <td>61</td>
        </tr>
        <tr>
          <td>April 6</td>
          <td>81</td>
        </tr>
        <tr>
          <td>April 7</td>
          <td>11</td>
        </tr>
      </table>
    </div>
    <div id="rightContainer">
      <table style="width: 200px;">
        <tr>
          <td>Day 1</td>
          <td>Day 2</td>    
          <td>Day 3</td>
          <td>Day 4</td>
          <td>Day 5</td>
          <td>Day 6</td>
          <td>Day 7</td>    
          <td>Day 8</td>
          <td>Day 9</td>
          <td>Day 10</td>
          <td>Day 11</td>
          <td>Day 12</td>    
          <td>Day 13</td>
          <td>Day 14</td>
          <td>Day 15</td>
          <td>Day 16</td>
          <td>Day 17</td>    
          <td>Day 18</td>
          <td>Day 19</td>
          <td>Day 20</td>
          <td>Day 21</td>
          <td>Day 22</td>    
          <td>Day 23</td>
          <td>Day 24</td>
          <td>Day 25</td>
          <td>Day 26</td>
          <td>Day 27</td>    
          <td>Day 28</td>
          <td>Day 29</td>
          <td>Day 30</td>
        </tr>
        <tr>
          <td>30 %</td>
          <td>29 %</td>    
          <td>28 %</td>
          <td>27 %</td>
          <td>26 %</td>
          <td>25 %</td>
          <td>24 %</td>
          <td>23 %</td>
          <td>22 %</td> 
          <td>21 %</td> 
          <td>20 %</td>
          <td>19 %</td>    
          <td>18 %</td>
          <td>17 %</td>
          <td>16 %</td>
          <td>15 %</td>
          <td>14 %</td>
          <td>13 %</td>
          <td>12 %</td> 
          <td>11 %</td> 
          <td>10...

CSS

table,th,td
{
border:1px solid black;
border-collapse:collapse;
table-layout:fixed;
}

td{
  width: 75px;
  padding: 0px 20px;
  height: 30px;
}
#mainContainer{
  width: 100%;
  
}
#leftContainer{
  width: 228px;
  display: inline-block;
}
#rightContainer{
  width: 300px;
  display: inline-block;
  overflow: auto;
}