afficher <div class="container3"> en survolant <div class="container1">

je veux afficher <div class="container3"> en survolant <div class="container1">,
mais je n'arrive pas à trouver la solution ! de l'aide svp :)

Code:

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.container1{
 
  display: inline-block;
 
  height: 100px;
  width: 150px;
  background-color: red;
  vertical-align: top;
  line-height: 20px;
  text-align: right;
  font-weight: 900;
  color: #F0F8FF;
  text-shadow: 1px 1px black;
  padding: 2px 5px;
  overflow: auto;
  box-shadow: 2px 2px 1px 1px rgba(0, 0, 0, 0.2);
  cursor: pointer;
}
.container3{
  display: none;
  margin-left: 210px;
  background-color: orange;
  height: 100px;
  width: 200px;
  margin: 0;
}
.container1:hover .container3{
 
  display: block;}