body {
    font-family: Arial, sans-serif;
    text-align: center;
}

.container {
    max-width: 400px;
    margin: 0 auto;
}

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

li {
    background: #f4f4f4;
    margin: 5px;
    padding: 10px;
    display: flex;
    justify-content: space-between;
}

button {
    cursor: pointer;
}