body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #f9f9f9;
}

h1 {
    font-size: 24px;
    margin-bottom: 20px;
}

input[type="text"] {
    padding: 10px;
    font-size: 16px;
    width: 300px;
    margin-bottom: 20px;
}

ul {
    list-style-type: none;
    padding: 0;
    width: 300px;
}

li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

li.completed {
    text-decoration: line-through;
    color: rgb(116, 110, 110);
}

button {
    background-color: #ff4d4d;
    border: none;
    color: white;
    padding: 5px;
    border-radius: 50%;
    cursor: pointer;
}

button:hover {
    background-color: #4b0000;
}