body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #e6e6e6;
}

.chat-container {
  width: 400px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  overflow: hidden;
}

#chat-box {
  height: 300px;
  overflow-y: scroll;
  padding: 15px;
  background-color: #f9f9f9;
}

.message {
  margin-bottom: 15px;
  padding: 10px;
  border-radius: 8px;
}

.sent {
  background-color: #4caf50;
  color: #fff;
  align-self: flex-end;
}

.received {
  background-color: #fff;
  color: #333;
}

.input-container {
  display: flex;
  padding: 15px;
  background-color: #f2f2f2;
}

#message-input {
  flex-grow: 1;
  padding: 10px;
  margin-right: 15px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

#send-button {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background-color: #4caf50;
  color: #fff;
}

.intro-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.intro-container img {
  width: 50%;
  min-width: 300px;
}

#loader {
  font-size: 25px;
  text-align: center;
}

.kakao-ad {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20px;

  min-width: 350px;
  min-height: 200px;
}