Sticky Table Header on Bootstrap Responsive Table

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<BR><BR><BR>

							<table class="table table-striped">
								<thead>
								<tr>
								<th scope="col">Lorem ipsum</th>
								<th></th>
								<th scope="col">Dolor sit amet</th>
								<th scope="col">Consectetur </th>
								<th scope="col">Adipiscing elit</th>
								<th scope="col">Sed do eiusmod tempor</th>
								<th scope="col">Incididunt </th>
								<th scope="col">Sit amet</th>
								</tr>
								</thead>
							  <tbody>
								<tr>
								 <td>6 AM</td>
								 <td>Lorem ipsum</td>
								 <td>Abcd efghij klmn</td>
								 <td>30 9002</td>
								 <td>30 9002</td>
								 <td>0.8888</td>
								 <td>63%</td>
								 <td>99 mph</td>
								</tr>
								<tr>
								 <td>6 AM</td>
								 <td>Lorem ipsum</td>
								 <td>Abcd efghij klmn</td>
								 <td>30 9002</td>
								 <td>30 9002</td>
								 <td>0.8888</td>
								 <td>63%</td>
								 <td>99 mph</td>
								</tr>
								<tr>
								 <td>6 AM</td>
								 <td>Lorem ipsum</td>
								 <td>Abcd efghij klmn</td>
								 <td>30 9002</td>
								 <td>30 9002</td>
								 <td>0.8888</td>
								 <td>63%</td>
								 <td>99 mph</td>
								</tr>
								<tr>
								 <td>6 AM</td>
								 <td>Lorem ipsum</td>
								 <td>Abcd efghij klmn</td>
								 <td>30 9002</td>
								 <td>30 9002</td>
								 <td>0.8888</td>
								 <td>63%</td>
								 <td>99 mph</td>
								</tr>
								<tr>
								 <td>6 AM</td>
								 <td>Lorem ipsum</td>
								 <td>Abcd efghij klmn</td>
								 <td>30...

CSS

/*th {
  background: white;
  position: sticky;
  top: 0;
}*/

.table-sticky th {
  background: #fff;
  position: sticky;
  top: -1px;
  z-index: 990;
}