Media Query as Bootstrap

bootstrap.css

@media(max-width:767px){}
@media(min-width:768px){}
@media(min-width:992px){}
@media(min-width:1200px){}

bootstrap.scss

// init -- for own taste
// rename desktop as laptop
$screen-laptop : $screen-desktop;
// rename large screen as desktop
$screen-desktop : $screen-lg-desktop;
// specially for the smart watches
$screen-mobile : 320px;

// normal mobile css first

@media(min-width:$screen-tablet){
  // tablet code here
}

@media(min-width:$screen-laptop){
  // laptop screen / desktop code here
}
@media(min-width:$screen-desktop){
  // large screen / desktop code here
}



// new way
// @media (max-width: 767px) {
@include media-breakpoint-down(sm) {}

mobile-menu-trigger.css

/* showing the mobile menu */
@media (max-width: 1070px) {
    .navbar-header {
        float: none;
    }
    .navbar-toggle {
        display: block;
    }
    .navbar-collapse {
        border-top: 1px solid transparent;
        box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    }
    .navbar-collapse.collapse {
        display: none!important;
    }
    .navbar-nav {
        float: none!important;
        margin: 7.5px -15px;
    }
    .navbar-nav>li {
        float: none;
    }
    .navbar-nav>li>a {
        padding-top: 10px;
        padding-bottom: 10px;
    }
}