body {
  padding: 0;
  margin: 0;
  background-color: #000;
}

.botao{
  background-color: #fc0;
  color:#000;
  padding:10px 20px;
  text-transform: uppercase;
  font-family: monospace;
  position: fixed;
  bottom: 0;
  left: 0;
  z-index: 10000;
  text-decoration: none;
}

.pisca{
  -webkit-animation: blink 1s infinite;
  animation: blink 1s infinite;
}

@-webkit-keyframes blink {
  0%, 49.9%, 100%   { opacity: 0; }
  50%, 99.9% { opacity: 1; }
}