#main{max-width:400px;margin:auto}  

@media(min-width:650px){  
    #main{max-width:100%;}
}

@media(min-width:992px){     
    #main {width:66.66%;padding:0 0px 0 0;float:left}
    #aside {width:33.33%;padding:0 0 0 36px;float:left;padding-top:42px}             
    .container-paragrafi p{font-size:19px;width:75%}
}