body {
  font-family: Arial, sans-serif;
  background: #f8f9fa;
  margin: 0;
  padding: 40px;
  text-align: center;
}
.container {
  max-width: 400px;
  margin: auto;
  background: #fff;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input[type="text"] {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
}
button {
  margin-top: 10px;
  padding: 10px;
  width: 100%;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
}
.chat-box {
  height: 300px;
  overflow-y: auto;
  background: #eee;
  padding: 10px;
  margin-bottom: 10px;
  text-align: left;
}
.own-message {
  background: #d1ffd1;
  padding: 5px;
  margin: 4px 0;
  border-radius: 4px;
}
.other-message {
  background: #ffffff;
  padding: 5px;
  margin: 4px 0;
  border-radius: 4px;
}
.ad-container {
  margin-top: 40px;
  text-align: center;
  padding: 10px;
  background-color: #f8f8f8;
  border-top: 1px solid #ddd;
}