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

.container {
    width: 80%;
    max-width: 800px;
    margin: 50px auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0px 0px 5px #ddd;
    padding: 20px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.add-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.add-item input[type="text"] {
    width: 80%;
    padding: 10px;
    border: none;
    border-radius: 5px;
    box-shadow: 0px 0px 5px #ddd;
}

.add-item button {
    width: 18%;
    border: none;
    border-radius: 5px;
    color: #fff;
    background-color: #333;
    padding: 10px;
    cursor: pointer;
    box-shadow: 0px 0px 5px #ddd;
}

.todo-list li {
    list-style: none;
    margin-bottom: 10px;
    border-radius: 5px;
    box-shadow: 0px 0px 5px #ddd;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
}

.todo-list li span {
    margin-right: 10px;
}

.todo-list li button {
    border: none;
    border-radius: 5px;
    color: #fff;
    background-color: #333;
    padding: 5px;
    cursor: pointer;
    box-shadow: 0px 0px 5px #ddd;
}