html { height: 100%; }
body { min-height: 100%; margin: 0; display: flex; justify-content: center; align-items: center; flex-direction: column; font-family: Avenir, Arial, sans-serif;}
button { 
  display: block;
  border-radius: 50%; 
  width: 200px;
  height: 200px;
  border: none;
  color: white;
  font-family: Avenir, Arial, sans-serif;
  font-weight: 900;
  font-size: 2rem;
  background: red;
  text-shadow: 0 3px 1px rgba(122,17,8,.8);
  box-shadow: 0 18px 0 rgb(183,9,0), 
    0 15px 20px rgba(0,0,0,.35);
  text-transform: uppercase;
  transition: .2s all ease-in;
  outline: none; 
  cursor: pointer;
  text-align: center;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}
button span { position: relative; }
/* fix for IE 11 (and IE8+, although the earlier versions are harder to address) stupidly moving the inner button text on click */
.pressed { 
  padding-top: 3px;
  transform: translateY(14px);
  box-shadow: 0 4px 0 rgb(183,0,0),
    0 8px 6px rgba(0,0,0,.45);
}

#textContainer {
  text-align: center;
}