* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

header h1 {
    text-align: center;
    margin-bottom: 20px;
    color: #3498db;
}

.todo-form {
    margin-bottom: 20px;
}

#todoForm {
    display: flex;
    gap: 10px;
}

#todoForm input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

#todoForm button {
    padding: 10px 20px;
    background: #3498db;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

#todoForm button:hover {
    background: #2980b9;
}

.todo-list h2 {
    margin-bottom: 10px;
    color: #3498db;
}

#todoList {
    list-style: none;
}

#todoList li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    background: #f9f9f9;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-bottom: 10px;
}

#todoList li.completed {
    text-decoration: line-through;
    color: #888;
}

#todoList li button {
    background: #e74c3c;
    color: #fff;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
}

#todoList li button:hover {
    background: #c0392b;
}