.Presence {
  float: left;
  width: 20%;
  min-width: 5cm;
  max-width: 15cm;
  padding: .2cm;
  background: #fff;
}

#editor {
  margin-left: 20%;
  /* This should have a min-margin-left: 5cm
     see http://buildinternet.com/2009/10/purely-css-faking-minimum-margins/
   */
}

@media screen and (max-width: 991px) {
  .Presence {
    float: none;
    position: absolute;
    bottom: 0;
    left: .5cm;
    border: 1px solid #777;
    border-radius: .3cm;
  }
  .Presence .Presence__Users,
  .Presence .Presence__Users,
  .Presence .Presence__Title small{
    display: none;
  }

  .Presence:hover, .Presence:active {
    height: 10cm;
    width: 5cm;
  }
  .Presence:hover .Presence__Users,
  .Presence:active .Presence__Users {
    display: block;
  }
  .Presence:hover .Presence__Title small,
  .Presence:active .Presence__Title small {
    display: inline;
  }

  #editor {
    margin-left: 0;
  }
}

.Presence {
  float: left;
  width: 20%;
  min-width: 5cm;
  max-width: 15cm;
  padding: .2cm;
  background: #fff;
}

#editor {
  margin-left: 20%;
  /* This should have a min-margin-left: 5cm
     see http://buildinternet.com/2009/10/purely-css-faking-minimum-margins/
   */
}

@media screen and (max-width: 991px) {
  .Presence {
    float: none;
    position: absolute;
    bottom: 0;
    left: .5cm;
    border: 1px solid #777;
    border-radius: .3cm;
    padding:0;
  }
  .Presence__Title {
    padding-left: .2cm;
  }
  .Presence__User {
    padding: 0 .2cm;
  }
  .Presence .Presence__Users,
  .Presence .Presence__Users,
  .Presence .Presence__Title small{
    display: none;
  }

  .Presence:hover, .Presence:active {
    height: 10cm;
    width: 5cm;
  }
  .Presence:hover .Presence__Users,
  .Presence:active .Presence__Users {
    display: block;
  }
  .Presence:hover .Presence__Title small,
  .Presence:active .Presence__Title small {
    display: inline;
  }

  #editor {
    margin-left: 0;
  }
}

Fix container padding in small-screen mode
Fix container padding in small-screen mode

so it's the same size as plugin-chat
