Hi there i created a responsive mobile website using this:
max-width(480px) {etc..}
+
Change your media query to a higher value?
max-width(600px) {etc..}
You can try and target specific orientation with your media query:
@media max-width(600px) and (orientation: landscape) {
rules for landscaped devices...
}
More on media queries:
https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries