body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(to right, #dfe9f3, #ffffff);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #fff;
  padding: 20px;
  width: 90%;
  max-width: 400px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  text-align: center;
}

h1 {
  margin-bottom: 15px;
}

.input-section {
  display: flex;
  gap: 10px;
}

input {
  flex: 1;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
}

button {
  padding: 10px;
  border: none;
  background: #4CAF50;
  color: white;
  border-radius: 8px;
  cursor: pointer;
}

button:hover {
  background: #45a049;
}

ul {
  list-style: none;
  padding: 0;
  margin-top: 20px;
}

li {
  background: #f1f1f1;
  padding: 10px;
  margin: 8px 0;
  border-radius: 8px;
  display: flex;
  justify-content: space-between;
}
.completed {
  text-decoration:none;
  opacity: 0.5;
  color:gray
}