media query only screen
@media not|only mediatype and (mediafeature and|or|not mediafeature) {
CSS-Code;
}
meaning of the not, only and and keywords:
not: The not keyword inverts the meaning of an entire media query.
only: The only keyword prevents older browsers that do not support media queries with media features from applying the specified styles. It has no effect on modern browsers.
and: The and keyword combines a media feature with a media type or other media features.
They are all optional. However, if you use not or only, you must also specify a media type.