default button color code example
Example 1: bootstarp btn colors
<button type="button" class="btn btn-primary">Blue</button>
<button type="button" class="btn btn-secondary">Grey</button>
<button type="button" class="btn btn-success">Green</button>
<button type="button" class="btn btn-danger">Red</button>
<button type="button" class="btn btn-warning">Yellow</button>
<button type="button" class="btn btn-info">Ligth blue</button>
<button type="button" class="btn btn-light">White</button>
<button type="button" class="btn btn-dark">Black</button>
<button type="button" class="btn btn-link">White with blue text</button>
Example 2: button style css
<a class="pure-button pure-button-primary" href="#">A Primary Button</a>
<button class="pure-button pure-button-primary">A Primary Button</button>