body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    padding: 20px;
    max-width: 600px;
    margin: auto;
}

h1 {
    text-align: center;
}

.form-add {
    display: flex;
    margin-bottom: 20px;
}

.form-add input {
    flex: 1;
    padding: 8px;
}

button {
    padding: 8px 12px;
    margin-left: 5px;
    cursor: pointer;
}

ul.task-list {
    list-style: none;
    padding: 0;
}

li {
    background: white;
    margin-bottom: 10px;
    padding: 10px;
    border-radius: 5px;
}

li.done {
    text-decoration: line-through;
    color: gray;
}

form.inline {
    display: inline;
}