index.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body{
    background-color: lavender;
    color: black;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    padding: 0;
    margin: 0;
  }

  .container{
    position:absolute;
    margin-top: 350px;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 25px;
    font-size: 25px;
}
   input{
    margin-top: 30px;
    outline: none;
    border: none;
    padding: 15px;
    width: 600px;
    height: 100px;
    font-size: 15px;
}
   button{
    margin-top: 40px;
    width:150px;
    color:white;
    background-color:black;
    font-size: 20px;
    font-family:'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-weight: 800;
}
  .chatbox_txt {
  margin-top: 20px;
  display: flex;
  overflow-y: scroll;
  flex-direction: column-reverse;
}

  .txt_item {
  max-width: 60.6%;
  width: fit-content;
}

  .txt_item--in {
  margin-left: auto;
  background-color:rgb(255, 216, 222);
}

  .txt_item--out {
  margin-right: auto;
  background-color:rgb(255, 167, 180);
}
  h6{
    margin-top: 30px;
  }
  a{
    text-decoration: none;
    color: black;
  }