JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="sk">
    <head profile="http://www.w3.org/2005/10/profile">
        <meta http-equiv="Content-Style-Type" content="text/css" >
        <meta http-equiv="Content-Language" content="sk" >
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" >
        <title>Test 2</title>
        

        
    </head>
    <body>
        
        <table class="CalendarReservationsBodyTable">
            <thead>        <tr><th colspan="97">Rezervovane auta</th></tr>        <tr>
                
                <th class="corner wideRow">Auto</th>            <th class="odd" colspan="4">0</th>            <th class="" colspan="4">1</th>            <th class="odd" colspan="4">2</th>            <th class="" colspan="4">3</th>            <th class="odd" colspan="4">4</th>            <th class="" colspan="4">5</th>            <th class="odd" colspan="4">6</th>            <th class="" colspan="4">7</th>            <th class="odd" colspan="4">8</th>            <th class="" colspan="4">9</th>            <th class="odd" colspan="4">10</th>            <th class="" colspan="4">11</th>            <th class="odd" colspan="4">12</th>            <th class="" colspan="4">13</th>            <th class="odd" colspan="4">14</th>            <th class="" colspan="4">15</th>            <th class="odd" colspan="4">16</th>            <th class="" colspan="4">17</th>            <th class="odd" colspan="4">18</th>            <th class="" colspan="4">19</th>            <th class="odd" colspan="4">20</th>            <th class="" colspan="4">21</th>            <th class="odd" colspan="4">22</th>            <th class="" colspan="4">23</th>        </tr>
                
            </thead>    <tbody>        <tr>
            <td class="alignRight wideRow">KE-260 FC - Octavia combi</td><td class=" borderLeft"></td>
            <td class="odd"></td>
            <td class=""></td>
            <td...

CSS

table{
            border-collapse: collapse;
            width: 100%;
            border: 1px solid black;
            background: #ddd;

            }
            table th, table td{
            border: 1px solid #000;
            width:20px;
            
            }
            table td.wideRow, table th.wideRow{
            width: 300px;
            }