body {
  background-color: #f5f5f5;
}
header > div {
  text-align: center;
  background-color: #ffbcff;
  padding: 15px 0;
  margin-bottom: 10px;
}
footer > div {
  text-align: center;
  background-color: #e7e7e7;
  padding: 10px 0;
  font-size: 12px;
  margin-top: 10px;
}
.div-tweet {
  text-align: center;
  margin: 10px;
}