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The simplest way to add a space in HTML (besides hitting the spacebar) is with the non-breaking space entity, written as or  
source: https://blog.hubspot.com/website/html-space
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<style>
.spacer {
margin: 10px; /* Adjust the value to control the amount of space */
}
</style>
<div class="spacer">
<!-- Your content here -->
</div>