Remove Or Disable Featured Slider On Mobile Version

Hello, Ho I can remove the featured slider in mobile version. I had been searching throught this forum and found a few members that have similar problem like me. But no one works. The css code that i trying so far:

/* Smartphones (portrait and landscape) ----------- */ @media only screen and (min-device-width : 320px) and (max-device-width : 640px) { #feature-slider { display: none; } } @media screen and (max-width: 480px) { #feature-slider { display: none; } }

My site: http://www.judibolaterbaik.com