#main {
    width:80%;
}
@media screen and (max-width: 899px) {#main {
    width:100%;
    }
}
@media screen and (max-width: 899px) {#right {
    float:left;
    clear:both;
    margin:0;
    padding:0;
    }
}
.mod_article {
    width:100%;
    float:left;
}
#right {
    padding:10px 10px 10px 20px;
}