#griffinforms-app-leftsidebar {
    width: 300px;
    box-shadow: rgba(0, 0, 0, 0.133) 1px 0px 0px 0px;
}

#griffinforms-app-leftsidebar .nav-underline {
    position: relative;
}

#griffinforms-app-leftsidebar .nav-underline::after {
    content: "";
    position: absolute;
    left: var(--gf-lefttab-underline-left, 0px);
    bottom: -1px;
    width: var(--gf-lefttab-underline-width, 0px);
    height: 2px;
    background: blueviolet;
    transition: left 0.2s ease, width 0.2s ease;
}