body {
  font-family: Arial, Helvetica, sans-serif;
  max-width: 600px;
  margin: auto;
  color: #535353;
  padding: 0.50rem;
}

h1,
h2 {
  background-color: #07a3fd;
  padding: 10px;
  color: #fff;
}

h1 {
  margin: 0px;
}

.centralizar {
  text-align: center;
}

ol,
ul {
  line-height: 40px;
}

.btn-youtube {
  background-color: #07a3fd;
  color: #fff;
  text-decoration: none;
  padding: 15px 32px;
  display: inline-block;
  border-radius: 10px;
  font-size: 16px;
  margin-top: 10px;
}

.btn-youtube:hover {
  background-color: #07a3fd;
}

footer {
  margin-top: 30px;
  text-align: center;
}