How to add Back to previous page arrow button

You can edit the page where you want to add this > Add a Code Block

and paste this code into Code Block

<button type="button" onclick="history.back();" class="back-previous">Back</button>
<style>
button.back-previous {
  background-color: transparent !important;
  border: none !important;
  background-image: url(https://images.squarespace-cdn.com/content/v1/66957a86f65d82345a6b6b02/68095797-1339-4b40-859f-a7674659f6e8/left-arrow-dark.png?format=100w);
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center center;
  color: transparent !important;
}
  </style>