[data-tooltip] {
    position: relative;
}

[data-tooltip]:hover::before {
    position: absolute;
    z-index: 1;
    top: 100%;
    padding: 0 4px;
    margin-top: 1px;
    border: 1px solid #40628a;
    background: black;
    color: white;
    content: attr(data-tooltip);
    min-width: 160px;
}

.technode {
    width: 256px;
}