[CSS3] CSS Media Queries

body{
    background-color: limegreen;
}

/*
    @media not|only mediatype and (expression)
        CSS-Code
*/

@media (min-width: 600px){
    body{
        background-color: pink;
    }
}

@media (max-width: 300px){
    body{
        background-color: red;
    }
}

@media (min-width: 400px) and (max-width: 500px){
    body{
        background-color: yellow;
        color: black;
    }
}