how to change css for mobile code example

Example 1: css different sreen size

/* For Mobile */
@media screen and (max-width: 540px) {
    .view {
        width: 400px;
    }
}

/* For Tablets */
@media screen and (min-width: 540px) and (max-width: 780px) {
    .view {
        width: 600px;
    }
}

Example 2: media query in css

@media screen and (min-width: 374px){
   section#rent_sectionn {
    padding: 0 20px !important;
}
 }