SOURCE

<div class='parent'>
  <span class='yes'>Yes!</span>
</div>

.parent{
  font-size:36px;
  padding-top:10px;
}
.yes{
  padding:.3em .8em;
  border:1px solid #446d88;
  background:#58a linear-gradient(#77a0bb,#58a);
  border-radius:.2em;
  box-shadow:0 .05em .25em grey;
  color:white;
  text-shadow:0 -.05em .05em #335166;
  font-size:125%;
  line-height:1.5;
}