Each of my media queries is getting a parse error when I try to validate css

Question

I am trying to validate a css file. Every one of my media queries is getting a parse error.

I have checked and I do not have any missing curly brackets, colons, or semi-colons.

I also set the W3C Validator to validate CSS 3.

Below is a sample of a media query that is getting a parse error:

@media and (min-width: 600px){
    h1.page-titles{
        font-size: 3.5em;
        margin-top: 25px;
        }
    }

What can be the problem?

Answer 1

Here is a working example code from my own CSS.

@media screen and (max-width: 750px) {

.cont-left{
    width: 85%;
}

}

You will notice the addition of the term screen.