How to change color of menu buttons

Hi there,

I am using GameZone theme and trying to change button color. Whatever I do they won't change. I changed rgb and rgba, but everything stays the same.

Here is the code of one button:

#mainmenu li:nth-child(2n), #mainmenu li:nth-child(2n) .inner {
		background: rgb(38,96,155); /* Old browsers */
        background: -moz-linear-gradient(top,  rgba(38,96,155,1) 1%, rgba(0,58,118,1) 100%); /* FF3.6+ */
        background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,rgba(38,96,155,1)), color-stop(100%,rgba(0,58,118,1))); /* Chrome,Safari4+ */
        background: -webkit-linear-gradient(top,  rgba(38,96,155,1) 1%,rgba(0,58,118,1) 100%); /* Chrome10+,Safari5.1+ */
        background: -o-linear-gradient(top,  rgba(38,96,155,1) 1%,rgba(0,58,118,1) 100%); /* Opera 11.10+ */
        background: -ms-linear-gradient(top,  rgba(38,96,155,1) 1%,rgba(0,58,118,1) 100%); /* IE10+ */
        background: linear-gradient(to bottom,  rgba(38,96,155,1) 1%,rgba(0,58,118,1) 100%); /* W3C */
        filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#26609b', endColorstr='#003a76',GradientType=0 ); /* IE6-9 */
	}

I managed to do it. Even after I cleared the cache chsnges didn't happen immidiatelly. But after few hours...