body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #f4f4f9;
}

#app {
  text-align: center;
  width: 80%;
}

button {
  padding: 10px 20px;
  margin: 10px;
  font-size: 16px;
  cursor: pointer;
}

input {
  padding: 10px;
  width: 80%;
  margin-bottom: 10px;
}

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

li {
  margin: 5px 0;
}