diff --git a/app/src/main/assets/viewer.css b/app/src/main/assets/viewer.css
index 83977ee7d..22f91b55e 100644
--- a/app/src/main/assets/viewer.css
+++ b/app/src/main/assets/viewer.css
@@ -68,3 +68,15 @@ body, canvas, #padding {
 .textLayer .endOfContent.active {
     top: 0px;
 }
+
+#content {
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  margin: auto;
+
+  width: 100%;
+  height: 100%;
+}
\ No newline at end of file
diff --git a/app/src/main/assets/viewer.js b/app/src/main/assets/viewer.js
index c11db9b06..1e6f485c2 100644
--- a/app/src/main/assets/viewer.js
+++ b/app/src/main/assets/viewer.js
@@ -95,7 +95,7 @@ function renderPage(pageNumber, zoom, prerender, prerenderTrigger=0) {
             return;
         }
 
-        const viewport = page.getViewport({scale: newZoomRatio, rotation: orientationDegrees})
+        const viewport = page.getViewport({scale: window.screen.width / page.getViewport({scale: 1}).width * newZoomRatio, rotation: orientationDegrees})
 
         if (useRender) {
             if (newZoomRatio !== zoomRatio) {
diff --git a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
index 606a1da79..01038f954 100644
--- a/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
+++ b/app/src/main/java/org/grapheneos/pdfviewer/PdfViewer.java
@@ -76,8 +76,8 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
         "usb 'none'; " +
         "vr 'none'";
 
-    private static final float MIN_ZOOM_RATIO = 0.5f;
-    private static final float MAX_ZOOM_RATIO = 1.5f;
+    private static final float MIN_ZOOM_RATIO = 0.9f;
+    private static final float MAX_ZOOM_RATIO = 3f;
     private static final int ALPHA_LOW = 130;
     private static final int ALPHA_HIGH = 255;
     private static final int ACTION_OPEN_DOCUMENT_REQUEST_CODE = 1;
@@ -88,7 +88,7 @@ public class PdfViewer extends AppCompatActivity implements LoaderManager.Loader
     private Uri mUri;
     public int mPage;
     public int mNumPages;
-    private float mZoomRatio = 1f;
+    private float mZoomRatio = MIN_ZOOM_RATIO;
     private int mDocumentOrientationDegrees;
     private int mDocumentState;
     private int windowInsetTop;