fix:修复不同比例动态计算，修复文字层的叠加问题

public/pdfjs-dist/web/pdf_viewer.css

@@ -15,11 +15,10 @@
 
 .textLayer {
   position: absolute;
-  left: 50%;
-  top: 50%;
-  transform: translate(-50%, -50%);
-  right: auto;
-  bottom: auto;
+  left: 0;
+  top: 0;
+  width: 100% !important;
+  height: 100% !important;
   overflow: hidden;
   opacity: 0.2;
   line-height: 1.0;
@@ -303,21 +302,22 @@
   cursor: pointer;
 }
 
-.pdfViewer .canvasWrapper {
+.pdfViewer {
   overflow: hidden;
-  width: 100%;
-  height: 100%;
+  align-self: unset;
+  align-content: center;
+}
 
+.pdfViewer .canvasWrapper {
+  overflow: hidden;
 }
 
 .pdfViewer .page {
   direction: ltr;
-  width: 816px;
-  height: 1056px;
   /* margin: 1px auto -8px auto; */
   position: relative;
   overflow: visible;
-  border: 9px solid transparent;
+  /* border: 9px solid transparent; */
   background-clip: content-box;
   -o-border-image: url(images/shadow.png) 9 9 repeat;
   border-image: url(images/shadow.png) 9 9 repeat;