Thread:Project:Support desk/Css code help

Hi can I have some help to change these css codes

.mp_header { width: 100%; clear: both; background-image: url('//upload.wikimedia.org/wikipedia/commons/1/10/Wikipedia-logo-v2-200px-transparent.png'); background-color: #008FCC; background-image: url('//upload.wikimedia.org/wikipedia/commons/1/10/Wikipedia-logo-v2-200px-transparent.png'), -moz-linear-gradient(top, #000, #f9f9f9, #ddd); background-image: url('//upload.wikimedia.org/wikipedia/commons/1/10/Wikipedia-logo-v2-200px-transparent.png'), -webkit-gradient(linear,            left top, left bottom, from(#ddd), to(#000)); filter: progid:DXImageTransform.Microsoft.Gradient(            StartColorStr='#008FCC', EndColorStr='#f9f9f9', GradientType=0); padding: 1px 10px 1px 10px; color: #000; border: none; margin-bottom:0px; }

I need to change it where it say moz to support what it does on WebKit because when visiting this http://simple-random-wikisaur.tk on chrome it has a black background on the header but when visiting http://simple-random-wikisaur.tk on internet explorer it has a blue colour header. Please help so that every browser will show the black header please. Thanks