aula2.css

#banner{
   width: 400px;
   
}
.caixa{
   position: relative;
   width: 940px;
   right: 0 auto;
}
header{
   background: #CCCCCC;
}
nav li{
   display: inline;     /*lista de lado*/
   margin: 0 0 0 15px; /*espasçamento*/
}
nav a{
   text-transform: uppercase;    /*dx maiusculo*/
   font-weight: bold;            /*negrito*/
   font-size: 22px;
   text-decoration: none;        


}
nav{
   position: absolute;
   top: 110px;
   right: 0;
}