body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  padding: 20px;
}

.container {
  background: white;
  padding: 20px;
  width: 450px;
  border-radius: 10px;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
}

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

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

.loader {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #007bff;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: girar 1s linear infinite;
  margin: 10px auto;
  display: none;
}

@keyframes girar {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}