* {
  margin: 0px;
  padding: 0px;
}
body {
  background-color: beige;
  font-family: Arial, Helvetica, sans-serif;
}

#container {
  width: 1100px;
  margin: 0px auto;
  border: 4px solid gray;
}

/*Segundo Paso*: Configurar Encabezado */
header {
  background-color: red;
  height: 100px;
  width:100%;
  margin: 0px;
  text-align: center;
  line-height: 100px;
  color: antiquewhite;
  border-bottom: 2px solid black;
}