body {
  font-family: sans-serif;
  background: #f4f4f4;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px #ccc;
}

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

input {
  flex: 1;
  padding: 10px;
  font-size: 1em;
}

button {
  padding: 10px 20px;
  font-weight: bold;
  cursor: pointer;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: #e3f2fd;
  padding: 10px;
  margin: 5px 0;
  border-radius: 5px;
  cursor: pointer;
}

li:hover {
  background: #bbdefb;
}

.mensaje {
  color: red;
  font-size: 0.9em;
}