.tooltip {
    position: relative;
    display: inline-block;
}
.tooltip {
    visibility: hidden;
    width: auto;
    background-color: #555;
    color: #fff;
    text-align: center;
    font-size: 14px;
    border-radius: 5px;
    padding:4px 4px 4px 4px;
    position: realtive;
    z-index: 1;  
    left: -80%; 
    bottom:75%
}
.imgico:hover + span {
    visibility: visible;
    opacity: 1;
}