tạo button bằng css

.... linear-gradient

 background: linear-gradient(to bottom, #14cf56 5%, #0f9c41 100%) repeat scroll 0 0 #14cf56; 

   box-shadow: 0 1px 0 0 #19e661 inset;

---- màu tím
 background: -moz-linear-gradient(center top , #6db3f2 0%, #54a3ee 50%, #3690f0 51%, #1e69de 100%) repeat scroll 0 0 rgba(0, 0, 0, 0);

---- mau cam
 background: -moz-linear-gradient(center top , #ffb76b 0%, #ffa73d 50%, #ff7c00 51%, #ff7f04 100%) repeat scroll 0 0 rgba(0, 0, 0, 0);

---- mau xanh lá cây
background: -moz-linear-gradient(center top , #9dd53a 0%, #a1d54f 50%, #80c217 51%, #7cbc0a 100%) repeat scroll 0 0 rgba(0, 0, 0, 0); 

link website: morningsuntravel