.plot-item.disabled {
    background-color: #aaa;
}

.plot-item.disabled .hover-popup {
    outline: 4px solid #aaaaaa;
}

.plot-item.disabled .hover-popup i {
    color: #aaaaaa;
}

.plot-item.disabled .hover-popup h4 {
    text-decoration: underline;
}

.plot-item.disabled .hover-popup:before {
    border: 4px solid #aaaaaa;
    border-bottom: inherit;
    border-right: inherit;
    box-shadow: inherit;
}