.editable {
    position: absolute;
    background-color: black;
    right: 0px;
    top: 0px;
    bottom: 0px;
    width: 25px;
    opacity: 0.5;
    text-align: center;
    visibility: hidden;
}

tr:hover > td > .editable {
    visibility: visible;
    cursor: pointer;
}

.editable span {
    position: relative;
}

tr > td.right {
    text-align: right;
}