.btn {
  position: relative;

  display: block;
  padding: 0;

  overflow: hidden;

  border-width: 0;
  outline: none;
  border-radius: 2px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);

  background-color: #2ecc71;
  color: #ecf0f1;

  transition: background-color 0.3s;
  color: #ffffff;
  font-family: "Roboto", sans-serif;
  font-size: 11px;
  font-weight: bold;
  padding: 6px 11px;
  display: inline-block;
}

.btn:hover,
.btn:focus {
  background-color: #27ae60;
}

.btn > * {
  position: relative;
}

.btn span {
  display: block;
  padding: 12px 24px;
}

.btn:before {
  content: "";

  position: absolute;
  top: 50%;
  left: 50%;

  display: block;
  width: 0;
  padding-top: 0;

  border-radius: 100%;

  background-color: rgba(236, 240, 241, 0.3);

  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.btn:active:before {
  width: 120%;
  padding-top: 120%;

  transition: width 0.2s ease-out, padding-top 0.2s ease-out;
}

.instrucciones {
  display: inline-block;
  color: #306108;
  font-family: "Roboto", sans-serif;
  font-size: 15px;
  font-weight: bold;
  padding: 6px 24px;
  float: right;
  margin: 50px 100px 0 -260px;
}

.twitter {
  float: left;
  margin: 50px -250px 0 100px;
}