{
    margin:0;
}

a {
    text-decoration: none;
  }
    a:link {color:gray;}
    a:visited {color:#4a4848;}
    a:active {color:#ffff00;}
    a:hover {color:#030303;}
   

body {
    margin: auto;
    max-width: 960px;
    color: #050000;
    background-color: #050000;
     }

header {
     margin: auto;
     background-color: gray;
     text-align: center;
       }
main {
     display:block;
     background-color: aqua;
     width: auto;    
     }

aside {
     background-color: beige;
     padding-bottom: 0.2em;
     padding-top: 0.2em;
     padding-left: 1em;
     padding-right: 1em;
      }
aside ul li {
    padding-bottom: 0.3em;
    padding-top: 0.3em;
    padding-left: 0.3em;
    padding-right: 0.3em;
            }
footer {
    margin: auto;
    background-color: gray;
    width: 960px;
    clear: both;
    text-align: justify;
    padding-top: 1em;
    padding-right: 2em;
    padding-bottom: 1em;
    padding-left: 2em;
       }

nav ul {
    margin: auto;
    text-align: left;
    list-style:none;
       }

#contenedor {
     background-color: aqua;
     width:960px;
     margin: auto;
     padding-top: 2em;
     padding-right: 2em;
     padding-bottom: 2em;
     padding-left: 2em;
     }

html {  
   background-color: gray; 
     }