@media only screen and (max-width: 1440px) { }  /* small desktop */

@media only screen and (max-width: 1280px) { }  /* laptop */

@media only screen and (max-width: 1024px) { }   /* tablet landscape */

@media only screen and (max-width: 768px) { }     /* tablet portrait */

@media only screen and (max-width: 480px) { }    /* mobile landscape */

@media only screen and (max-width: 320px) { }   /* mobile portrait */