title: Changing the restrictions from the last table th
body: <p>I have the following table</p>
  
  <pre><code>&lt;table&gt;
    &lt;TableHeader className="execution-head"/&gt;
      &lt;tbody&gt;
        &lt;tr className={this.props.className} onClick={this.handleClick}&gt;
          &lt;th&gt;{this.props.execution_id}&lt;/th&gt;
          &lt;th&gt;{this.props.launch_time}&lt;/th&gt;
          // more th's here
        &lt;/tr&gt;
        &lt;tr className={this.props.className} onClick={this.handleClick}&gt;
          &lt;th&gt;{this.props.execution_id}&lt;/th&gt;
          &lt;th&gt;{this.props.launch_time}&lt;/th&gt;
          // more th's here
        &lt;/tr&gt;
        &lt;tr&gt;
          &lt;th&gt;+&lt;/th&gt;
        &lt;/tr&gt;
      &lt;/tbody&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p><strong>output:</strong></p>
  
  <pre><code>&lt;table data-reactid=".1"&gt;
   &lt;thead data-reactid=".1.0"&gt;
    &lt;tr class="execution-head" data-reactid=".1.0.0"&gt;
       &lt;th data-reactid=".1.0.0.0"&gt;ID&lt;/th&gt;
       &lt;th data-reactid=".1.0.0.1"&gt;Launch Time&lt;/th&gt;
       &lt;th data-reactid=".1.0.0.5"&gt;Execution Time&lt;/th&gt;
    &lt;/tr&gt;
   &lt;/thead&gt;
   &lt;tbody data-reactid=".1.1"&gt;
    &lt;tr class="execution-row" data-reactid=".1.1.0:$4x324"&gt;
       &lt;th data-reactid=".1.1.0:$4x324.0"&gt;4x324&lt;/th&gt;
       &lt;th data-reactid=".1.1.0:$4x324.1"&gt;11.11.15 13:30&lt;/th&gt;
       &lt;th data-reactid=".1.1.0:$4x324.5"&gt;2&lt;/th&gt;
    &lt;/tr&gt;
    &lt;tr class="execution-row" data-reactid=".1.1.0:$4823748"&gt;
       &lt;th data-reactid=".1.1.0:$4823748.0"&gt;4823748&lt;/th&gt;
       &lt;th data-reactid=".1.1.0:$4823748.1"&gt;13.11.15 13:30:25&lt;/th&gt;
       &lt;th data-reactid=".1.1.0:$4823748.5"&gt;34&lt;/th&gt;
    &lt;tr class="table-plus" data-reactid=".1.1.1"&gt;
       &lt;th data-reactid=".1.1.1.0"&gt;+&lt;/th&gt;
    &lt;/tr&gt;
   &lt;/tbody&gt;
  &lt;/table&gt;
  </code></pre>
  
  <p>I want to make the last tr element take the whole width of the table, but from everything that I've tried it always comes out wrong.</p>
  
  <p>P.S this is written with react if you are wondering</p>