<div>
  <button>Default</button>
</div>
<div>
  <button class="old">Reset Old Way</button>
</div>
<div>
  <button class="simple">Reset Simple Way</button>
</div>
.old {
  background: none;
  border: none;
  outline: none;
  padding: 0px;
  margin: 0px;
}
.simple {
  all: unset;
}

External CSS

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External JavaScript

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