<style type="text/css">

/*** CSS Responsive media query breakpoints ***/

/*** PC ***/

@media screen and (min-width: 810px) {
.div {
display:none;
}
}

/*** Mobile ***/

@media screen and (max-width: 809px) {

.div {
display:block;
}
}



/***
set breakpoints for common device groups instead of specific devices:
***/

/* Extra small devices (phones, 600px and down) */
@media only screen and (max-width: 600px) {...}
/* Small devices (portrait tablets and large phones, 600px and up) */
@media only screen and (min-width: 600px) {...}
/* Medium devices (landscape tablets, 768px and up) */
@media only screen and (min-width: 768px) {...}
/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {...}
/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {...}


</style>