Edit in JSFiddle

<h4>Why does the earth spins?</h4>
<table>
    <tr>
        <td id="first">It’s the conservation of angular momentum.</td>
    </tr>
    <tr>
        <td>Think about the individual atoms in the cloud of hydrogen. </td>
    </tr>
    <tr>
        <td>Each particle has its own momentum as it drifts through the void.</td>
    </tr>
    <tr>
        <td>It might be possible to average out perfectly to zero, but it’s really really unlikely.</td>
    </tr>
    <tr>
        <td>Which means, there will be some left over. Like a figure skater pulling in her arms to spin more rapidly, the collapsing proto-Solar System with its averaged out particle momentum began to spin faster and faster.
        </td>
    </tr>
</table>
#first {
    background-color: yellow;
}