.center { 
    text-align: center; 
}
hr {
    border: 0;
    height: 1px;
    background: #000;
    background-image: -webkit-linear-gradient(left, #fff, #000, #fff);
    background-image: -moz-linear-gradient(left, #fff, #000, #fff);
    background-image: -ms-linear-gradient(left, #fff, #000, #fff);
    background-image: -o-linear-gradient(left, #fff, #000, #fff);
}