body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  margin: 0;
}
.container {
  max-width: 600px;
  margin: auto;
  padding: 15px;
  background: white;
}
textarea {
  width: 100%;
  height: 100px;
}
button {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
}
.history-item {
  border-bottom: 1px solid #ddd;
  padding: 10px 0;
}
audio {
  width: 100%;
}
.delete {
  color: red;
  cursor: pointer;
  font-size: 12px;
}