how to set up media queries for mobile first code example

Example 1: media query for mobile view css

@media only screen and (max-width: 600px) {
  body {
    background-color: lightblue;
  }
}

Example 2: media query for mobile landscape only

@media screen and (orientation:landscape) and
(min-device-width: 320px) and (max-device-width: 450px) {
   /* Input Styles */
}