.thumbnail{
position: relative;
z-index: 0;
}

.thumbnail:hover{
background-color: transparent;
z-index: 50;
}

.thumbnail span{
position: absolute;
/*background-color: lightyellow; */
padding: 5px;
overflow:inherit;
left: -1000px;   /*-1000*/
/* border: 1px dashed gray; */
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail span img{
border-width: 0;
padding: 2px;
}

.thumbnail:hover span{
visibility: visible;
left: -450px; /*90*/
top: -200px;
vertical-align:middle;
}