jsFiddle-style Button

Done with HSL and shadows.

HTML

<div class="button">Button</div>

CSS

.button {
  font-family: 'Lato', sans-serif;
    padding: 0.625rem 2.5rem 0.5625rem 2.5rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.75rem;
    display: inline-block;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    webkit-border-radius: 100px;

}