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CSS Sass Basics Improve Your Workflow with Sass Extend the Properties of Selectors

In a previous video, I already consolidated the button classes with ampersand.

The workspace doesn't load the stylesheet the way it appears in the video. I previously used ampersand to consolidate the button classes:

.btn {
  color: $white;
  display: inline-block;
  font-weight: bold;
  text-decoration: none;
  text-transform: uppercase;
  padding: 0.75em 1.5em;
  border-radius: 0.35em;
  &-callout {
    font-size: 1.1em;
    background-color: $color-secondary;
  &-info {
    font-size: 0.85em;
    background-color: $color-primary;  
    margin-top: auto;

What is the advantage of using @extend vs the way it was previously taught? The backtracking here is a bit annoying.