body{
background-color: lightgray;
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;
}
/*Tercer Paso: Crear Menu*/
nav ul li {
float: left;
list-style: none;
margin: 20px;
line-height: 10px;
}