body {
  background-color: rgb(253, 251, 251);
}

#cabecalho {
  top: 0;
  position: fixed;
}

table {
  width: 80%;
}

footer {
  padding: 5px;
  margin-top: 20px;
  margin-bottom: 20px;
}

article , aside {
  margin: 20px;
  width: 60%;
}

img {
  border: 3px grey solid;
}