JSFiddle - React, Tailwind, and code Playground

HTML

<div class="dashboardBox">
    <div class="dashboardBoxBody">
        <table style="width:200%" class="standardTable">
            <tr>
                <th id="header_detail">Location</th>
                <th id="header">Jan-13</th>
                <th id="header">Feb-13</th>
                <th id="header">Mar-13</th>
                <th id="header">Apr-13</th>
                <th id="header">May-13</th>
                <th id="header">Jun-13</th>
                <th id="header">Jul-13</th>
                <th id="header">Aug-13</th>
                <th id="header">Sep-13</th>
                <th id="header">Oct-13</th>
                <th id="header">Nov-13</th>
                <th id="header">Dec-13</th>
            </tr>
            <tr>
                <td id="header_detail">Australia</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
            </tr>
            <tr>
                <td id="header_detail">California</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
                <td id="detail">80.5%</td>
            </tr>
            <tr>
                <td...

CSS

div.dashboardBox {
    border: 1px solid #999999;
    width: 45%;
    margin-right: 20px;
    margin-bottom: 20px;
    float: left;
}
div.dashboardBoxBody {
    padding: 8px;
    height: 200px;
    overflow: auto;
    margin-left : 5em;    
}
table.standardTable {
    position: static;
    width: 95%;    
}
.standardTable th {
    font-size: 11px;
    background-color: #888888;
    color: #FFFFFF;
    font-weight: bold;
    text-align: left;
    border: 1px solid #AAAAAA;
}
#header_detail {
    text-align: left;   
    left : 0;    
}