body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #00b09b, #96c93d);
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: #fff;
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  width: 350px;
  text-align: center;
}

h1 {
  margin-bottom: 20px;
}

.input-area {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
}

input {
  width: 70%;
  padding: 8px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

button {
  background: #00b09b;
  color: white;
  border: none;
  border-radius: 5px;
  padding: 8px 15px;
  cursor: pointer;
  margin-left: 5px;
}

button:hover {
  background: #028a74;
}

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

li {
  background: #f4f4f4;
  padding: 10px;
  border-radius: 5px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.3s;
}

li.completed {
  text-decoration: line-through;
  color: gray;
  background: #dcdcdc;
}

.clear {
  background: crimson;
  margin-top: 10px;
}

.clear:hover {
  background: darkred;
}