* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background-color: #fff;
  padding: 20px;
  margin: 0px 20px 0px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  width: 400px;
}
h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #333;
}

.input-container {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  justify-content: center;
  align-items: center;
}

input[type="text"] {
  flex: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.input-container button {
  padding: 10px 20px;
  background-color: #28a745;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}
.input-container button:hover {
  background-color: #218838;
}

ul {
  list-style-type: none;
}
li {
  padding: 10px;
  cursor: pointer;
  background-color: #f7eeee;
  border-radius: 4px;
  margin-bottom: 5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

li .delete-btn {
  background-color: #dc3545;
  color: #fff;
  border: none;
  border-radius: 4px;
  padding: 5px 10px;
  cursor: pointer;
}
li .delete-btn:hover {
  background-color: #c82333;
}
.completed span {
  text-decoration: line-through;
  opacity: 0.6;
}