*{
    margin: 0;
    padding: 0;
    box-sizing: 0;
}

.computadora { /* tooltips de computadora ferreteria */
    font-size: 14px;
    font-weight: normal;
    color: yellow;
    text-decoration: none;
    position: relative;
}

.computadora:hover {
    text-decoration: underline;
}

.computadora:hover .computadora-box{
    display: inline-block;
}

.computadora-box {
    display: none;
    position: absolute;
    background: yellow;
    border: blue 2px solid;
    line-height: 20px;
    z-index: 1000;
    text-align: left;
    color: blue;
    font-size: 10px;
    padding: 3px 45px;
    border-radius: 12px;
    left: -17px;
    right: 0;
    bottom: -100px;
    width: 165px;
}

.computadora-box::after {
    content: "";
    display: block;
    border-top: 7px solid blue;
    border-left: 7px solid transparent;
    border-right: 7px solid transparent    ;
    position: absolute;
    bottom: -8px;
    left: calc(50% - 7px);
}

b {
    color:blue;
} /* tooltips de computadora ferreteria */