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>

<style type="text/css">
#CalendarReservationsBody table.CalendarReservationsBodyTable, #CalendarHolidaysBody table.CalendarHolidaysBodyTable{
    width: 100%;
    border-spacing: 0px;
    border-collapse: collapse;
    background: #F9F5D7;
    border: 1px solid #000;
    table-layout: fixed;
}
#CalendarHolidaysBody table.CalendarHolidaysBodyTable{
    margin-top: 1em;
    width: 100%;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable th, #CalendarHolidaysBody table.CalendarHolidaysBodyTable th{
    text-align: left;
    font-weight: normal;
    padding: 0.1em 0.5em;
    border: 1px solid #000;
    width: 6px;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable td.borderLeft, #CalendarHolidaysBody table.CalendarHolidaysBodyTable td.borderLeft{
    border-left: 1px solid #000;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable td, #CalendarHolidaysBody table.CalendarHolidaysBodyTable td{
    border: 0px;
    border-bottom: 1px solid #000;
    padding: 0.1em 0.5em;
    width: 6px;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable td.wideRow, #CalendarReservationsBody table.CalendarReservationsBodyTable th.wideRow
,#CalendarHolidaysBody table.CalendarHolidaysBodyTable td.wideRow, #CalendarHolidaysBody table.CalendarHolidaysBodyTable th.wideRow{
    width: 100px;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable thead th, #CalendarHolidaysBody table.CalendarHolidaysBodyTable thead th{
    text-align: center;
    font-weight: bold;
    background-color: #6FA7D1;
    color: #FFF;
}
#CalendarReservationsBody table.CalendarReservationsBodyTable...