#phone {
  width: 300px;
  height: 600px;
  border: 16px solid #333;
  border-radius: 36px;
  position: relative;
  background: #000;
  margin: 20px auto;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
}

.screen {
  width: 100%;
  height: 100%;
  background: #f0f0f0;
  border-radius: 20px;
  padding: 20px;
  box-sizing: border-box;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.message-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.message {
  max-width: 70%;
  padding: 10px 15px;
  border-radius: 18px;
  font-family: sans-serif;
  font-size: 14px;
  line-height: 1.4;
}

.message.received {
  background-color: #e0e0e0;
  align-self: flex-start;
}

.message.sent {
  background-color: #d1f1ff;
  align-self: flex-end;
}