body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background: yellowgreen;
}

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

input, button {
  padding: 10px;
  margin: 10px 0;
  width: 100%;
  box-sizing: border-box;
}

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

li {
  background: #e2e2e2;
  margin-bottom: 8px;
  padding: 10px;
  border-radius: 4px;
}