.pdf-viewer {
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    background: #f9f9f9;
    border: 1px solid #ddd;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.toolbar {
    display: flex;
    gap: 10px;
    padding: 10px;
    background: #eee;
    justify-content: center;
    align-items: center;    
    border-bottom: 1px solid #ddd;
}

    .toolbar div {
        padding: 6px 10px;
        border-radius: 4px;
        user-select: none;
        cursor: pointer;
        transition: background 0.2s;
    }

        .toolbar div:hover {
            background: #ddd;
        }

    .toolbar img{
        width: 14px;
    }

    .pdf-container {
        height: 100vh;
        overflow: auto;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding: 10px;
        scroll-behavior: smooth;
        white-space: nowrap;
        overflow-x: auto;
    }

.toolbar div input {
    width: 30px;
    height: 24px;
    outline: none;
    text-align: center;
}

    .toolbar div input[type="number"]::-webkit-outer-spin-button,
    .toolbar div input[type="number"]::-webkit-inner-spin-button {
        -webkit-appearance: none;
        margin: 0;
    }

    .toolbar div input[type="number"] {
        -moz-appearance: textfield; /* Đối với Firefox */
    }

.page {
    display: flex;
    justify-content: center;
    padding: 5px 0;
    background: white;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    margin-bottom: 10px;
}

canvas {
    display: block;
}