.thumbnail{
position: relative;
z-index: 1005;
}

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

.thumbnail span
{ 
position: absolute;
/*background-color: lightyellow;*/
padding: 0px;
border: 1px dashed gray;
visibility: hidden;
color: black;
text-decoration: none;
}

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

.thumbnail:hover span
{
visibility: visible;
top: 50px;
right: 100px; 
z-index:1004;
}