style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, sans-serif;
}
html {
  font-size: 62.5%;
}
body {
  background-color: #161616;
  color: white;
  display: flex;
  height: 100vh;
  overflow: hidden;
}
.sidebar {
  width: 28rem;
  background-color: #222121;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
}
.sidebar h1 {
  font-size: 2.4rem;
  color: #bfbfbf;
}
.new-chat {
  background-color: #2d2d2d;
  padding: 1.2rem;
  border-radius: .8rem;
  color: white;
  font-weight: bold;
  text-align: center;
  cursor: pointer;
  margin-top: 2rem;
}
.new-chat:hover {
  background-color: #3d3d3d;
}
.past-chats {
  margin-top: 2rem;
  color: #bfbfbf;
}
.chat-item {
  padding: 1rem;
  background-color: #1e1e1e;
  border-radius: .6rem;
  margin-top: .5rem;
  cursor: pointer;
}
.chat-item:hover {
  background-color: #2d2d2d;
}
.main {
  flex: 1;
  margin-left: 30rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  text-align: center;
  width: calc(100% - 30rem);
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.message-area {
  width: 100%;
  max-width: 100%;
  margin-top: 1.5rem;
  text-align: left;
  flex-grow: 1;
  margin-bottom: 10rem;
  overflow-y: auto; 
}
.main h2 {
  font-size: 3.8rem;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande",
    "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  color: #bfbfbf;
  margin-bottom: 1rem;
}
.main h2 span {
  color: #5e1ceb;
}
.message {
  background: #2d2d2d;
  padding: 1rem;
  border-radius: 3rem;
  margin: .5rem 0;
  max-width: 80%;
  font-size: 1.5rem;
}
.user-message {
  background-color: #3d3d3d;
  text-align: right;
  margin-right: 1rem;
  margin-left: auto;
  margin-bottom: 2rem;
  margin-top: 1.5rem;
  width: 40%;
}
.bot-message {
  background-color: #2d2d2d;
  text-align: left;
  margin-top: 1rem;
  margin-bottom: 1rem;
  width: 40%;
}
.chat-input {
  background-color: #1e1e1e;
  width: 60rem;
  display: flex;
  align-items: center;
  padding: 1rem;
  border-radius: .8rem;
  border: #5f50e7 1px solid;
  position: fixed;
  bottom: 2.5rem;
  left: 60%;
  transform: translateX(-50%);
}
.chat-input input {
  flex: 1;
  background: none;
  border: none;
  color: white;
  outline: none;
  font-size: 1.6rem;
  padding: 1rem;
}
.chat-input button {
  background-color: #3a57c9;
  border: none;
  padding: 1rem 1.5rem;
  border-radius: .6rem;
  color: white;
  cursor: pointer;
  margin-left: .5rem;
}
.chat-input button:hover {
  background-color: #575757;
}
.upload-btn {
  background-color: #3d3d3d;
  border: none;
  padding: 1rem 1.5rem;
  border-radius: .6rem;
  color: rgb(255, 255, 255);
  cursor: pointer;
  margin-right: .5rem;
}
.upload-btn:hover {
  background-color: #575757;
}
.file-preview {
  background-color: #3d3d3d;
  border-radius: .6rem;
  color: white;
  padding: .5rem;
  margin-left: 1rem;
  display: inline-block;
}
.new-chat {
  background-color: #5a48ff;
  padding: 1.2rem;
  border-radius: .8rem;
  color: white;
  font-weight: bold;
  text-align: center;
  cursor: pointer;
  margin-top: 2rem;
  font-size: 1.5rem;
}
.new-chat:hover {
  background-color: #503dfb;
}
.past-chats {
  margin-top: 2rem;
  color: #bfbfbf;
  font-size: 1.5rem;
}
.chat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background-color: #1e1e1e;
  border-radius: .6rem;
  margin-top: .5rem;
  cursor: pointer;
}
.chat-item:hover {
  background-color: #2d2d2d;
}
.delete-chat {
  background: none;
  border: none;
  color: #ff4d4d;
  cursor: pointer;
  font-size: 1.6rem;
}
.delete-chat:hover {
  color: #ff0000;
}
#message-area {
  overflow-y: auto;
  height: 40rem;
}

.upload-btn:active,
.chat-input button:active {
  background-color: #474747;
}
#message-area::-webkit-scrollbar {
  width: .8rem;
}
#message-area::-webkit-scrollbar-thumb {
  background-color: #5e1ceb;
  border-radius: .4rem;
}
.message {
  transition: background-color 0.3s ease;
}
.message:hover {
  background-color: #4a4a4a;
}

.message-content {
  display: flex;
  align-items: center;
}

.user-message .message-content {
  justify-content: flex-end;
}

.bot-message .message-content {
  justify-content: flex-start;
}

.user-logo,
.bot-logo {
  margin: 0 .8rem;
}

.user-logo img,
.bot-logo img {
  border-radius: 50%;
  width: 3.5rem;
}

@media (max-width: 1200px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 1100px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 1080px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 1060px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 1040px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
  
}

@media (max-width: 1024px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 1000px) {
  html{
    font-size: 50%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 980px) {
  html{
    font-size: 50%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 960px) {
  html{
    font-size: 50%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 992px) {
  html{
    font-size: 55%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 950px) {
  html{
    font-size: 50%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 850px) {
  html{
    font-size: 45%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 800px) {
  html{
    font-size: 45%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 790px) {
  html{
    font-size: 45%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}



@media (max-width: 768px) {
  html{
    font-size: 50%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 640px) {
  html{
    font-size: 45%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 480px) {
  html{
    font-size: 40%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}
@media (max-width: 400px) {
  html{
    font-size: 35%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 320px) {
  html{
    font-size: 30%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 280px) {
  html{
    font-size: 20%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 240px) {
  html{
    font-size: 10%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}

@media (max-width: 120px) {
  html{
    font-size: 5%;
  }
  .sidebar {
    width: 100%;
    position: static;
    padding: 1rem;
  }
  .chat-input {
    width: 100%;
    left: 0;
    transform: none;
  }
}