body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    width: 300px;
    text-align: center;
}

#addCardBtn {
    margin-bottom: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

.card-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.card-item {
    background-color: #fff;
    border: 1px solid #ccc;
    border-radius: 8px;
    margin: 10px 0;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateX(-100%);
    transition: all 0.4s ease;
}

.card-item.show {
    opacity: 1;
    transform: translateX(0);
}

.delete-btn {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 5px 10px;
    font-size: 14px;
    cursor: pointer;
    position: absolute;
    top: 10px;
    right: 10px;
}

.card-item.hide {
    transform: translateX(100%);
    opacity: 0;
}