“We ought to take outdoor walks in order that the mind may be strengthened and refreshed by the open air and much breathing.".
Seneca

@media

The @media CSS at-rule can be used to apply part of a style sheet based on the result of one or more media queries. With it, you specify a media query and a block of CSS to apply to the document if and only if the media query matches the device on which the content is being used.
@media css reference