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

.container {
  max-width: 400px;
  margin: 50px auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input[type="text"] {
  width: calc(100% - 90px);
  padding: 10px;
  margin-bottom: 10px;
}

button {
  padding: 10px 15px;
  background: #007bff;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

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

li {
  background: #e9e9e9;
  margin: 5px 0;
  padding: 10px;
  border-radius: 4px;
}
@media (max-width: 600px) {
  .container {
    width: 90%;
    margin: 20px auto;
  }
}