White background
Gray background
Light gray background
Dark gray background
No background
<div class="white-bg ">
White background
</div>
<div class="gray-bg ">
Gray background
</div>
<div class="light-gray-bg ">
Light gray background
</div>
<div class="dark-gray-bg ">
Dark gray background
</div>
<div class="no-bg ">
No background
</div>