.button {
border-radius: 0 4px 4px 0;
background: rgba(76, 76, 76, 1);
/* Old Browsers */
background: -moz-linear-gradient(top, rgba(76, 76, 76, 1) 0%, rgba(89, 89, 89, 1) 12%, rgba(102, 102, 102, 1) 25%, rgba(71, 71, 71, 1) 39%, rgba(44, 44, 44, 1) 50%, rgba(0, 0, 0, 1) 51%, rgba(17, 17, 17, 1) 60%, rgba(43, 43, 43, 1) 76%, rgba(28, 28, 28, 1) 91%, rgba(19, 19, 19, 1) 100%);
/* FF3.6+ */
background: -webkit-gradient(left top, left bottom, color-stop(0%, rgba(76, 76, 76, 1)), color-stop(12%, rgba(89, 89, 89, 1)), color-stop(25%, rgba(102, 102, 102, 1)), color-stop(39%, rgba(71, 71, 71, 1)), color-stop(50%, rgba(44, 44, 44, 1)), color-stop(51%, rgba(0, 0, 0, 1)), color-stop(60%, rgba(17, 17, 17, 1)), color-stop(76%, rgba(43, 43, 43, 1)), color-stop(91%, rgba(28, 28, 28, 1)), color-stop(100%, rgba(19, 19, 19, 1)));
/* Chrome, Safari4+ */
background: -webkit-linear-gradient(top, rgba(76, 76, 76, 1) 0%, rgba(89, 89, 89, 1) 12%, rgba(102, 102, 102, 1) 25%, rgba(71, 71, 71, 1) 39%, rgba(44, 44, 44, 1) 50%, rgba(0, 0, 0, 1) 51%, rgba(17, 17, 17, 1) 60%, rgba(43, 43, 43, 1) 76%, rgba(28, 28, 28, 1) 91%, rgba(19, 19, 19, 1) 100%);
/* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(76, 76, 76, 1) 0%, rgba(89, 89, 89, 1) 12%, rgba(102, 102, 102, 1) 25%, rgba(71, 71, 71, 1) 39%, rgba(44, 44, 44, 1) 50%, rgba(0, 0, 0, 1) 51%, rgba(17, 17, 17, 1) 60%, rgba(43, 43, 43, 1) 76%, rgba(28, 28, 28, 1) 91%, rgba(19, 19, 19, 1) 100%);
/* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(76, 76, 76, 1) 0%, rgba(89, 89, 89, 1) 12%, rgba(102, 102, 102, 1) 25%, rgba(71, 71, 71, 1) 39%, rgba(44, 44, 44, 1) 50%, rgba(0, 0, 0, 1) 51%, rgba(17, 17, 17, 1) 60%, rgba(43, 43, 43, 1) 76%, rgba(28, 28, 28, 1) 91%, rgba(19, 19, 19, 1) 100%);
/* IE 10+ */
background: linear-gradient(to bottom, rgba(76, 76, 76, 1) 0%, rgba(89, 89, 89, 1) 12%, rgba(102, 102, 102, 1) 25%, rgba(71, 71, 71, 1) 39%, rgba(44, 44, 44, 1) 50%, rgba(0, 0, 0, 1) 51%, rgba(17, 17, 17, 1) 60%, rgba(43, 43, 43, 1) 76%, rgba(28, 28, 28, 1) 91%, rgba(19, 19, 19, 1) 100%);
/* W3C */
filter: progid: DXImageTransform.Microsoft.gradient(startColorstr='#4c4c4c', endColorstr='#131313', GradientType=0);
/* IE6-9 */
display: inline-block;
line-height: 2em;
padding: 0 10px;
color: #FFF;
}
<div class="button">This is a button</div>