css button font size code example

Example 1: edit button html

<button style="height: 30px; background-color: none; border-radius:50%" id="edit_btn"> 
 <img src="https://www.flaticon.com/svg/static/icons/svg/61/61456.svg" style="height: 20px; width:15px; float:center; text-align: center" />
</button>`

Example 2: 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>