Bottom Border Gradient
HTML
<div>Content</div>
CSS
div {
/* gradient shining border */
border-top:0;
border-left:0;
border-right:0;
border-bottom-style: solid;
border-bottom-width: 10px;
border-image: linear-gradient(to left, rgba(0, 0, 0, 0) 1%, rgba(2,49, 79, 7) 50%, rgba(0, 0, 0, 0) 100%)
10% 0 10% 0/1px 0 1px 0 stretch;
border-image-width: 0 0 10px 0;
border-image-repeat: stretch;
/* other demo stuff */
height: 50px;
line-height: 50px;
background-color: #fff;
color: white;
text-align: center;
}