body {
    font-family: sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    background: #fff;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h1 {
    color: #333;
    margin-bottom: 20px;
}

.input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#task-input {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

#add-task-btn {
    padding: 10px 15px;
    border: none;
    background-color: #5cb85c;
    color: white;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#add-task-btn:hover {
    background-color: #4cae4c;
}

#task-list {
    list-style: none;
    padding: 0;
    text-align: left;
}

#task-list li {
    background: #f9f9f9;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background-color 0.3s;
}

#task-list li.completed {
    text-decoration: line-through;
    color: #888;
    background-color: #e9e9e9;
}

.task-text {
    flex-grow: 1;
}

.task-actions {
    display: flex;
    gap: 5px;
}

.delete-btn {
    border: none;
    background: none;
    color: #e74c3c;
    font-size: 1.2em;
    cursor: pointer;
}