@media (min-width:1800px) {
  
#content1 {
width: 1252px;
}

#content2 {
display: none;
}

#aside {
width: 280px;
}
}

@media (min-width:1280px) AND (max-width:1799px) {
  
#content1 {
width: 750px;
}

#content2 {
display: none;
}

#aside {
width: 200px;
}
}

@media (min-width:1000px) AND (max-width:1279px){
  
#content1 {
width: 610px;
}

#content2 {
display: none;
}

#aside {
width: 200px;
}