dear fellas
im designing my vertical navigation menu.
and i seems to cant apply this
position: relative;
padding: 0 12px 0 37px;
font-size: 13px;
color: white;
text-shadow: 0 1px rgba(0, 0, 0, 0.35);
background: #505968;
border-top: 1px solid #878e96;
border-bottom: 1px solid #333740;
background-image: -webkit-linear-gradient(top, #707a84, #505968);
background-image: -moz-linear-gradient(top, #707a84, #505968);
background-image: -o-linear-gradient(top, #707a84, #505968);
background-image: linear-gradient(to bottom, #707a84, #505968);
-webkit-transition: opacity 0.15s;
-moz-transition: opacity 0.15s;
-o-transition: opacity 0.15s;
transition: opacity 0.15s;
some of it got errors such as
Error 39 '-webkit-linear-gradient(top, #707a84, #505968)' is not a valid value for the 'background-image' property.
Error 38 'text-shadow' is not a known CSS property name.
can anyone help my how to solve this?