Any basic HTML can be applied within your lot description.
You need the following HTML to embed a button, where the LINK-URL is set to the target URL you want to re-direct the user too and the BUTTON-NAME reads the text you want to display on the button.
<a href="LINK-URL" class="mat-focus-indicator mat-flat-button mat-button-base mat-accent ng-star-inserted" target="_blank">BUTTON-NAME</a>
Example 1.
LINK-URL= https://irostrum.com/saas-terms-conditions/
BUTTON-NAME = Our Terms
<a href="https://irostrum.com/saas-terms-conditions/" class="mat-focus-indicator mat-flat-button mat-button-base mat-accent ng-star-inserted" target="_blank">Our Terms</a>
Example 2.
LINK-URL= https://irostrum.com/media/bkvb0l3e/sample-auction-data.zip
BUTTON-NAME = Sample Data
<a href="https://irostrum.com/media/bkvb0l3e/sample-auction-data.zip" class="mat-focus-indicator mat-flat-button mat-button-base mat-accent ng-star-inserted" target="_blank">Sample Data</a>