<input type="submit"/>
body {
  display: flex;
  min-height: 500px;
  justify-content: center;
  align-items: center;
  background: #f8a;
}
input[type="submit"] {
  display: block;
  font-family: Verdana,"Rockwell",Helvetica,Serif;
  font-size: 20px;
  width: 120px;
  height: 120px;
  background: #fff;
	padding: 10px;
	border: 0;
	outline: 0;
	border-radius: 50%;
  color: #171717;
  transition: all 200ms;
  cursor: pointer;
}
input[type="submit"]:focus {
  background: transparent;
  color: transparent;
  border: none;
  border-top: solid 3px #f8a;
  border-left: solid 3px #fff;
  animation: spin 700ms linear infinite;
}
@keyframes spin {
  to {transform: rotate(360deg);}
}

External CSS

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External JavaScript

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