@charset "utf-8";

*{
box-sizing :border-box;
    
}

*{
    font-family:"Trebuchet MS", Arial,  sans-serif;
    
}

img {
    max-width: 100%;
    height: auto;
}

#pagina {
    max-width: 100%;
    margin: 0 auto;
    width: 100%;
    
}




header {background-color: brown;
    margin-bottom: 1em;
    margin-left: 1em;
    margin-right: 1em;
    margin-top: 1em;
}

header nav ul { 
    list-style: none; 
    margin: 0; 
    padding: 0;
    text-align: right;
}
   
    header nav ul li { 
        display: inline-block;
        margin-right: 1em;
    }
        
header nav ul li a {
    display:block;
    background-color: brown;
    color: burlywood;
    text-decoration: none;
}
    

header nav ul li a:hover { 
    background-color: brown;
    color:white;    
}

main {
    background-color: cadetblue;
    margin-bottom: 1em;
    margin-left: 1em;
    margin-right: 1em;
    margin-top: 0;
    }

aside {
    background-color: burlywood;
    margin-bottom: 1em;
    margin-left: 1em;
    margin-right: 1em;
        
}
    
footer {
    background-color: darkgray;
    clear:both;
    margin-bottom: 1em;
    margin-left: 1em;
    margin-right: 1em;
    margin-top: 1em;
    
    
    }


#contenido {
    padding: 1em 0;
    overflow: auto;
    
}

header, main, aside, footer {
    padding: 1em;   
}

main, aside {
    float:left;
}


     body { 
    background-image: url(DSC_0100-630x418.jpg);
    background-position: center; 
            background-repeat: no-repeat;
            background-size: cover;
         width: 100%;
         height: auto
}



@media screen and (min-width: 50em) {
    
    
    }
    
    main {
        width: 65%;   
        margin-right: 0;
    }
    
    aside {
        width: 25%;
    }
    
}

header {
    background-color: rgba(311,111,111,0.5);  
    margin-bottom: 1em;
}

main {
    background-color: rgba(100,100,300,0.7);  
    margin-bottom: 1em;
}

aside {
    background-color: rgba(111,376,124,0.7);  
    margin-bottom: 1em;
    font-size: 12px;
}