body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  display: flex;
  justify-content: center;
  padding-top: 50px;
}

#app {
  background: white;
  padding: 20px;
  border-radius: 8px;
  width: 300px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 { text-align: center; }

input {
  width: 70%;
  padding: 8px;
}

button {
  padding: 8px;
  width: 25%;
  background: #317EFB;
  color: white;
  border: none;
  cursor: pointer;
  margin-top: 5px;
}

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

li {
  padding: 5px;
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid #eee;
}

li button {
  background: red;
}