diff --git a/static/js/app.js b/static/js/app.js
index c331aff..3a6e212 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -2836,7 +2836,7 @@ async function _parsePdfOutline(pdf, items, depth) {
 }
 
 async function renderPdf(arrayBuffer, contentEl, scaleOverride) {
-  const pdf = currentPdfDoc || await pdfjsLib.getDocument({data: new Uint8Array(arrayBuffer)}).promise;
+  const pdf = currentPdfDoc || await pdfjsLib.getDocument({data: new Uint8Array(arrayBuffer.slice(0))}).promise;
   currentPdfDoc = pdf;
 
   let pdfTitle = '', pdfAuthor = '';
@@ -2854,7 +2854,7 @@ async function renderPdf(arrayBuffer, contentEl, scaleOverride) {
 
   contentEl.innerHTML = '';
 
-  const containerWidth = contentEl.clientWidth - 32;
+  const containerWidth = Math.min(contentEl.clientWidth - 32, 900);
 
   for (let pageNum = 1; pageNum <= pdf.numPages; pageNum++) {
     const page = await pdf.getPage(pageNum);