A Pen by Cornelius Schmale.

index.html

<input type="button" class="rounded" value="This is a CSS3 rounded corner button"/>

Rounded-Corner-CSS3-Button.markdown

Rounded Corner CSS3 Button

A Pen by Cornelius Schmale on CodePen.

License.

style.css

input {
  padding: 20px;  
}

input[type=button].rounded {
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
}