.thumbnail{
    /* top:50%; */
}

.progress{
    background: -webkit-gradient(linear, 0 0, 0 100%, from(#7BC3FF), color-stop(0.5,#42A9FF), to(#7BC3FF));  
    width: 0%;  
    height: 100%;  
    -webkit-border-radius: 10px;  
    -webkit-transition: width 1s ease-in-out;
}