body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    text-align: center;
    margin: 0;
    padding: 0;
}

header {
    background: #4CAF50;
    color: white;
    padding: 15px;
}

.todo-container {
    background: white;
    max-width: 400px;
    margin: 30px auto;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

#taskInput {
    padding: 10px;
    width: 70%;
    border: 1px solid #ccc;
    border-radius: 5px;
}

#addTaskBtn {
    padding: 10px 15px;
    background: #4CAF50;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

#addTaskBtn:hover {
    background: #45a049;
}

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

li {
    padding: 10px;
    margin-top: 5px;
    background: #f9f9f9;
    display: flex;
    justify-content: space-between;
    border-radius: 5px;
}

li.completed {
    text-decoration: line-through;
    background: #d4edda;
}

button.delete-btn {
    background: red;
    color: white;
    border: none;
    padding: 5px 8px;
    cursor: pointer;
    border-radius: 5px;
}