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

.thumbnail:hover{
background-color: transparent;
z-index: 5;
}

.thumbnail span{
position: absolute;
background-color: #ffffff;
padding: 5px;
left: -10px;
border: 1px  gray;
visibility: hidden;
color: black;
text-decoration: none;
}

.thumbnail span img{
border-width: 1px;
padding: 10px;
}

.thumbnail:hover span{
visibility: visible;
top: 0;
left: 100px;}