.local/share/jupyter/nbextensions/snippets_menu/snippets_menu.css

/*

  The left-side dropdown submenu is adapted from the usual right-side code at
  <https://github.com/ipython/ipython/blob/master/IPython/html/static/style/style.min.css#L10664>

*/
.dropdown-submenu-left > .dropdown-menu {
  left: auto;
  right: 100%;
}

/* For space-saving menus */
.dropdown-submenu > .dropdown-menu.dropdown-menu-compact {
  left: 50%;
  top: 100%;
}
.dropdown-submenu-left > .dropdown-menu.dropdown-menu-compact {
  left: auto;
  right: 50%;
}

.dropdown-submenu-left > a:after {
  visibility: hidden;
}
.dropdown-submenu-left > a:before {
  display: inline-block;
  font: normal normal normal 14px/1 FontAwesome;
  font-size: inherit;
  text-rendering: auto;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transform: translate(0, 0);
  display: block;
  content: "\f0d9";
  float: left;
  color: #333333;
  margin-top: 2px;
  margin-left: -10px;
}


/*

  The following allows for control of the "tooltip" that shows the code to be
  inserted when the item is clicked.  Without this, the tooltip might wrap the
  code, making it hard to read; will cut off some of the code; won't be
  monospaced; etc.  Note that these CSS selectors select any <a/> element with
  an attribute `data-snippet-code`.  This attribute is necessary and sufficient
  for us to add the pop-up.

*/
a[data-snippet-code]:after {
    content: attr(data-snippet-code); /* Read from the data-snippet-code attribute */
    font-family: monospace;
    font-size: 75%;
    position: absolute;
    width: auto;
    display: table;
    left: 50%;
    white-space: pre;
    z-index: 10000;
    background: #E8E8E8;
    padding: 4px;
    border-color : #AAA;
    border-style: solid;
    border-width: 1px;
    visibility: hidden;
}
a[data-snippet-code]:hover:after {
    visibility: visible;
    transition: all 0s ease 1s;
}