body, html {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

.container {
    max-width: 600px;
    margin: auto;
    padding: 20px;
}

h1 {
    text-align: center;
}

#todoForm {
    display: flex;
    margin-bottom: 20px;
}

#todoInput {
    flex: 1;
    padding: 10px;
    margin-right: 10px;
    font-size: 16px;
}

button {
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
}

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

li {
    padding: 10px;
    border-bottom: 1px solid #ccc;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

li:last-child {
    border-bottom: none;
}

.completed {
    text-decoration: line-through;
}