div.msg_bbl {
    background-color: #ddd;
    padding: 5px 15px;
    border-radius: 10px;
    color: #555;
    margin-bottom: 5px;
    font-family: 'Roboto', sans-serif;
  }
  div.msg_bbl_st {
    background-color: #ddf;
    padding: 5px 10px;
    border-radius: 10px;
    color: #555;
    margin-bottom: 5px;
    font-family: 'Roboto', sans-serif;
  }
  section.background_section {
    background-color: #fff;
    padding: 2%;
  }
  div.chatbot_container {
    background-color:#f7f7f7;
    padding: bottom 3rem;
    min-height:30rem;
    padding-top: 3rem;
  }
  div.ch_chatbot {
    background-color:#007bff;
  }
  div.ch_classifier {
    background-color:#ffc107;
  }
  div.ch_file_upload {
    background-color:#28a745;
  }
  div.cb_image {
    width:100%;
  }
  div.auxiliar_text {
    color: #ccc;
  }
  h4.auxiliar_text {
    color: #ccc;
  }
  h2.auxiliar_text {
    color: #ccc;
  }
  div.holder_style {
    padding-top: 5px;
  }
  b.student_color {
    color: #3E539C;
  }
  b.teacher_color {
    color: #000;
  }
  div.chat_form {
    margin-top: 2rem;
  }
  div.threshold_div {
    background-color: #f7f9f9;
  }