JSFiddle - React, Tailwind, and code Playground

HTML

<table class="fixed_header">
  <thead>
    <tr>
      <th>Col 1</th>
      <th>Col 2</th>
      <th>Col 3</th>
      <th>Col 4</th>
      <th>Col 5</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>row 1-0</td>
      <td>row 1-1</td>
      <td>row 1-2</td>
      <td>row 1-3</td>
      <td>row 1-4</td>
    </tr>
    <tr>
      <td>row 2-0</td>
      <td>row 2-1</td>
      <td>row 2-2</td>
      <td>row 2-3</td>
      <td>row 2-4</td>
    </tr>
    <tr>
      <td>row 3-0</td>
      <td>row 3-1</td>
      <td>row 3-2</td>
      <td>row 3-3</td>
      <td>row 3-4</td>
    </tr>
    <tr>
      <td>row 4-0</td>
      <td>row 4-1</td>
      <td>row 4-2</td>
      <td>row 4-3</td>
      <td>row 4-4</td>
    </tr>
    <tr>
      <td>row 5-0</td>
      <td>row 5-1</td>
      <td>row 5-2</td>
      <td>row 5-3</td>
      <td>row 5-4</td>
    </tr>
    <tr>
      <td>row 6-0</td>
      <td>row 6-1</td>
      <td>row 6-2</td>
      <td>row 6-3</td>
      <td>row 6-4</td>
    </tr>
    <tr>
      <td>row 7-0</td>
      <td>row 7-1</td>
      <td>row 7-2</td>
      <td>row 7-3</td>
      <td>row 7-4</td>
    </tr>
  </tbody>
</table>

CSS

.fixed_header tbody{
  display:block;
  overflow-y:scroll;
  overflow-x: hidden;
  height:100px;
}
.fixed_header thead tr{
   height:20px;
}
table {
  border-collapse: collapse;
}

table tr {
  background-color: #f8f8f8;
  border: 1px solid #ddd;
  padding: .35em;
}

table th {
background-color: #545556;
    color: white;
  padding: .425em;
  text-align: center;
}

table td {
  padding: .425em;
  text-align: center;
	word-wrap: break-word;
	font-size: 0.75em;
}

table th {
  font-size: .75em;
  letter-spacing: .1em;
  text-transform: uppercase;
}

thead tr {
  display: table;
  width: 100%;
  table-layout: fixed;
}

tbody tr {
  display: table;
  width: 100%;
  table-layout: fixed;
}