This snippet will give your links a smooth and simple easing transition between its regular and hover state.
Transitions
Note: This effect will only be shown in latest browsers. Older browsers will just use your regular hover effect.
/* Links hover transition */
a:hover, a {
-webkit-transition: all 135ms ease-in;
-moz-transition: all 135ms ease-in;
-o-transition: all 135ms ease-in;
-ms-transition: all 135ms ease-in;
transition: all 135ms ease-in;
}