static/TopologyComposer/css/d3-context-menu.css

.d3-context-menu {
    position: absolute;
    display: none;
    background-color: #f2f2f2;
    border-radius: 4px;

    font-family: Arial, sans-serif;
    font-size: 14px;
    min-width: 150px;
    border: 1px solid #d4d4d4;

    z-index:1200;
}

.d3-context-menu ul {
    list-style-type: none;
    margin: 4px 0px;
    padding: 0px;
    cursor: default;
}

.d3-context-menu ul li {
    padding: 4px 16px;

    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none;   /* Chrome/Safari/Opera */
    -khtml-user-select: none;    /* Konqueror */
    -moz-user-select: none;      /* Firefox */
    -ms-user-select: none;       /* Internet Explorer/Edge */
    user-select: none;
}

.d3-context-menu ul li:hover {
    background-color: #4677f8;
    color: #fefefe;
}

/*
	Header
*/

.d3-context-menu ul li.is-header,
.d3-context-menu ul li.is-header:hover {
    background-color: #f2f2f2;
    color: #444;
    font-weight: bold;
    font-style: italic;
}

/*
	Disabled
*/

.d3-context-menu ul li.is-disabled,
.d3-context-menu ul li.is-disabled:hover {
    background-color: #f2f2f2;
    color: #888;
    cursor: not-allowed;
}

/*
	Divider
*/

.d3-context-menu ul li.is-divider {
    padding: 0px 0px;
}

.d3-context-menu ul li.is-divider:hover {
    background-color: #f2f2f2;
}

.d3-context-menu ul hr {
    border: 0;
    height: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}