.sq_contextmenu {
  position: fixed;
  display: table;
  min-width:40mm;
  box-shadow: 0 0 5px grey;
  visibility:hidden;
}

.sq_contextmenuitem,
.sq_contextmenugroup{
  position: relative;
   border:1px solid grey;
  padding:1mm;
  cursor:pointer;
  background:whitesmoke;
}
.sq_contextmenuitem:not(:last-child),
.sq_contextmenugroup:not(:last-child){
  margin-bottom:-1px;
}

.sq_contextmenuitem:hover,
.sq_contextmenugroup:hover{
  background: rgb(210,210,210);
}

.sq_contextmenugroup:after{
  content:"\25b6";
  font-size:12px;
  color:rgb(60,60,60);
  position: absolute;
  right:1mm;
}
.sq_contextmenugroup > div {
  position: absolute;
  min-width:40mm;
  box-shadow: 0 0 5px grey;
  left:100%;
}