Controlling the height of Materialize's slider with media queries . . .

[CodeNoobster]

Hi guys I am trying to make Materialize's slider more responsive. I have removed the default height from the materialize.min.js file (as per attachment), but my media queries have no affect on the height. Can any one point out what I am doing wrong?

@media only screen and (min-width : 320px) {
    .slider{height: 150px !important;}  
}
/* Extra Small Devices, Phones */ 
@media only screen and (min-width : 480px) {
    .slider{height: 200px !important;}  
}
/* Small Devices, Tablets */
@media only screen and (min-width : 768px) {
    .slider{height: 250px !important;}  
}
/* Medium Devices, Desktops */
@media only screen and (min-width : 992px) {
    .slider{height: 300px !important;}  
}
/* Large Devices, Wide Screens */
@media only screen and (min-width : 1200px) {
    .slider{height: 350px !important;}  
}
 

Thanks in advance.