seahub/frontend/src/css/tree-view-contextmenu.css

.right-tree-menu {
  position: absolute;
  left: -1000rem;
  top: -1000rem;
  z-index: 1000;
  float: left;
  min-width: 10rem;
  padding: 0.5rem 0;
  margin: 0.125rem 0 0;
  font-size: 0.9375rem;
  color: #212529;
  text-align: left;
  list-style: none;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid rgba(0, 40, 100, 0.12);
  border-radius: 3px;
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.right-tree-divider {
  height: 0;
  margin: 0.5rem 0;
  overflow: hidden;
  border-top: 1px solid #e9ecef;
}

.right-tree-item {
  display: block;
  width: 100%;
  padding: 0.25rem 1.5rem;
  clear: both;
  font-weight: 400;
  color: #878E9C;
  text-align: inherit;
  white-space: nowrap;
  background-color: transparent;
  border: 0;
  cursor: pointer;
}
.right-tree-item:hover {
  color: #15181A;
  background-color: #F8F9FA;
}