Updated `.pdf-viewer-container` to vertically center content by changing `align-items` to `center`. Adjusted `.pdf-frame` dimensions to use dynamic height and width, added a maximum width, and centered text alignment. Introduced rounded corners to the gradient bar with a `border-radius`. Changed `.pdf-canvas` to `inline-block` display with `vertical-align: top`. Further refined `.pdf-frame` layout with slightly different height and width calculations.
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