.main {
    margin-top: 10px;
    padding: 0 2px;
    text-align: center;
  }
  
  #avatar {
    display: block;
    margin: auto auto;
  }

  
  #post {
    padding: 0 1em;
  }
  
  #post img {
    display: block;
    width: 90%;
    height: 90%;
    margin: auto auto;
    padding-top: 1em;
    background-color: whitesmoke;
  }
  
  #post video {
    width: 90%;
    height: 90%;
  }