.container_main{
    width: 1440px;
    margin-right: auto;
    margin-left: auto;
}
@media (max-width: 1440px) {
    .container_main{
        width: 1320px;
    }
}
@media (max-width: 1400px) {
    .container_main{
        width: 1140px;
    }
}
@media (max-width: 1200px) {
    .container_main{
        width: 970px;
    }
}
@media (max-width: 970px) {
    .container_main{
        width: 760px;
    }
}
@media (max-width: 768px) {
    .container_main{
        width: 100%;
        padding-right: 20px;
        padding-left: 20px;
    }
}