html - Media queries in my css do not work -

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i have issues media queries. seems not work in either browser. tried in opera, chrome, firefox. page http://amatalents.com/about-us.html , media-queries main div section 

    @media screen , (min-width: 150) , (max-width: 400) {        .windows div {            width: 100%;            display: table-column;          }        .windows div {            font-size: 10px;            color: green;          }        .windows {            background-color: red;          }        }

i validated css file , first time did fine , mentioned css parser error reffering media queries part of file, second time referred media queries without mentioning parser error. lost... please help!

you missing px. @media screen , (min-width: 150px) , (max-width: 400px)


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