add buttons css code example
Example 1: button style css
<div class="pure-button-group" role="group" aria-label="...">
<button class="pure-button">A Pure Button</button>
<button class="pure-button">A Pure Button</button>
<button class="pure-button pure-button-active">A Pure Button</button>
</div>
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>