body {
  margin: 0;
  font-family: sans-serif;
  background: #121212;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
.chat-container {
  background: #1f1f1f;
  border-radius: 10px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 0 10px rgba(33, 166, 7, 0.7);
  position: relative;
}
.chat-header {
  background: #21a607;
  padding: 15px;
  font-weight: bold;
  text-align: center;
  border-radius: 10px 10px 0 0;
}
.chat-box {
  padding: 10px;
  height: 300px;
  overflow-y: auto;
  background: #1a1a1a;
}
.chat-box div {
  margin: 10px 0;
}
.chat-box .user {
  text-align: right;
  color: #90ee90;
}
.chat-box .bot {
  text-align: left;
  color: #ffffff;
}
#chat-form {
  display: flex;
  border-top: 1px solid #333;
}
#user-input {
  flex: 1;
  padding: 10px;
  border: none;
  background: #2a2a2a;
  color: #fff;
}
button {
  background: #21a607;
  color: white;
  border: none;
  padding: 0 15px;
  cursor: pointer;
}
.whatsapp-button {
  position: absolute;
  bottom: 60px;
  right: 15px;
  background: #25D366;
  color: white;
  padding: 8px 12px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 14px;
}