body {
  text-align: center;
  padding-top: 15px;
}

.container {
  margin-bottom: 20px;
}

a {
  display: inline-block;
  text-decoration: none;
  padding: 10px 20px;
  background: #888;
  border-radius: 5px;
  font-family: Helvetica;
  text-transform: uppercase;
  color: #fff;
  box-shadow: 2px 4px 10px rgba(0,0,0,0.4);
  margin-right: 10px;
  transition: box-shadow 0.2s ease-out;
}

a:hover {
  box-shadow: 3px 8px 10px rgba(0,0,0,0.5);
  background: black;
}