/*Ipad ngang(1024 x 768)
@media screen and (max-width: 1024px){
    #wrapper{ width: 100%;}
}
Ipad dọc(768 x 1024)
@media screen and (max-width: 768px){
    #content{ width: 100%; float: none;}
    #sidebar { width: 100%;float: none; padding-left: 0px;}
}
Tablet nhỏ(480 x 640)
@media screen and (max-width: 480px){
    
}
Iphone(480 x 640)
@media screen and (max-width: 320px){
    
}
Smart phone nhỏ
@media screen and (max-width: 240px){
    
}*/