Some of your code would be better.
But you can just use a gradient generator, with the right colors, like this one.
So you could have something like :
background: #3dbeb2;
background: -moz-linear-gradient(left, #3dbeb2 0%, #02b5d1 100%);
background: -webkit-linear-gradient(left, #3dbeb2 0%,#02b5d1 100%);
background: linear-gradient(to right, #3dbeb2 0%,#02b5d1 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr="#3dbeb2", endColorstr="#02b5d1",GradientType=1 );
Edit : Didn’t see your code edit.