请帮帮我。我只想让我的两个DIV连接起来，让hr坐在他们相遇的地方。我做了很多研究，就是找不到我想要的答案。

顺晟科技：

将此css添加到人力资源

body {
    font-family: "Lato", sans-serif;
    margin: 0%;
    padding: 0%;
  }

  hr{
      margin: 0 auto;
      padding: 0 auto;
      width: 25%;
      align-self: center;
      border-style: dotted;
      border-bottom: none;
      border-left: none;
      border-right: none;
      border-color: lightgrey;
      border-width: 6px;
  }

  .top-nav{
      background-color: #111;
      height: 75px;
  }

  #top-container{
      height: 500px;
      width: 100%;
      background-image: linear-gradient(to bottom right, rgb(204, 231, 229), rgb(33, 55, 95));
      display:inline-block;
  }

  #middle-container{
      height: 500px;
      width: 100%;
      background-image: linear-gradient(to bottom right, rgb(204, 231, 229), rgb(33, 55, 95));
      display: inline-block;
  }


  .sidebar {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #111;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
  }
  
  .sidebar a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    font-size: 25px;
    color: #818181;
    display: block;
    transition: 0.3s;
  }
  
  .sidebar a:hover {
    color: #f1f1f1;
  }
  
  .sidebar .closebtn {
    position: absolute;
    top: 0;
    right: 25px;
    font-size: 36px;
    margin-left: 50px;
  }
  
  .openbtn {
    font-size: 20px;
    cursor: pointer;
    background-color: #111;
    color: white;
    padding: 10px 15px;
    border: none;
  }
  
  .openbtn:hover {
    background-color: #444;
  }
  
  #main {
    transition: margin-left .5s;
    padding: 16px;
  }
  
  /* On smaller screens, where height is less than 450px, change the style of the sidenav (less padding and a smaller font size) */
  @media screen and (max-height: 450px) {
    .sidebar {padding-top: 15px;}
    .sidebar a {font-size: 18px;}
  }