/*@media only screen and (max-width: 1920px)
{   
    .middle-sec{margin: 0 auto;width: 1260px;}
}
@media only screen and (max-width: 1600px)
{
    .middle-sec{margin: 0 auto;width: 1280px;}
}
@media only screen and (max-width: 1366px)
{
    .middle-sec{margin: 0 auto;width: 1260px;}
}
@media only screen and (max-width: 1280px)
{
    .middle-sec{margin: 0 auto;width:1260px;}
}*/