.table-specs
{
    position: relative;
}
.table-specs:hover > .more-specs
{
    display: block;
}

.table-specs .more-specs
{
    border: 1px solid #dee2e6;
    border-radius: 10px 10px 10px 10px;
    background: #f2f2f2;
    min-width: 200px;
    position: absolute;
    bottom: 110%;
    left: 50%;
    display: none;
}

.table-specs .more-specs ul li
{
    padding: 10px;
}