.post-nav{
    margin-bottom: 0;
    box-shadow: none;
    border-bottom: 1px solid #efefef;
}
.post-nav span{
    padding: 12px 12px 10px 12px;
}
.post-nav span.current:after{
    height: 1px;
    content: "";
    left: 0;
    right: 0;
    position: absolute;
    bottom: -1px;
    background: #282828;
}
.post-nav{
    margin-bottom: 25px;
    background: #FFF;
    -webkit-box-shadow: 0 0 6px 0 rgba(0,0,0,0.1);
    -moz-box-shadow: 0 0 6px 0 rgba(0,0,0,0.1);
    box-shadow: 0 0 6px 0 rgba(0,0,0,0.1);
}
.post-nav span{
    cursor: pointer;
    position: relative;
    display: inline-block;
    padding: 20px 7px;
    margin-right: 1px;
    -moz-transition: all 0.3s ease-in-out;
    -webkit-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}
.post-nav span.current,.post-nav span:hover{
    background: #282828;
    color: #FFF;
}