What needs to be specified in CSS to configure and…

The media query @media is used. Inside it, conditions are set for applying styles based on device characteristics or viewport area.

Main parameters of media queries:

width / height: Width/height of the viewport.
min-width / min-height: Minimum width/height of the viewport.
max-width / max-height: Maximum width/height of the viewport.
orientation: Device orientation (portrait or landscape).

Example of usage for setting breakpoints:

/* Default styles for screens smaller than 768px */
body {
  font-size: 16px;
}

/* Breakpoint for screens from 768px to 991px */
@media (min-width: 768px) and (max-width: 991px) {
  body {
    font-size: 18px;
  }
}

/* Breakpoint for screens 992px and above */
@media (min-width: 992px) {
  body {
    font-size: 20px;
  }
}

Common strategies for setting breakpoints:

Mobile First: Styles are first set for the smallest screens, then media queries with min-width are added for larger screens.
Desktop First: Styles are first set for larger screens, then media queries with max-width are added for narrower screens.

The choice of strategy depends on the project and preferences.

Standard breakpoint values (approximate, depending on framework or agreement):

Device	Width range	Media query (Mobile First)	Media query (Desktop First)
Small phones	< 576px	Not used (base styles)	`@media (max-width: 575.98px)`
Phones	>= 576px	`@media (min-width: 576px)`	`@media (max-width: 767.98px)`
Tablets	>= 768px	`@media (min-width: 768px)`	`@media (max-width: 991.98px)`
Laptops	>= 992px	`@media (min-width: 992px)`	`@media (max-width: 1199.98px)`
Desktops	>= 1200px	`@media (min-width: 1200px)`	`@media (max-width: 1399.98px)`
Large desktops	>= 1400px	`@media (min-width: 1400px)`	Not used (base styles)

It is important to choose breakpoints based on content and layout, not device standards. They should trigger where the layout begins to 'break'.

What needs to be specified in CSS to configure and apply these breakpoints?