diff --git a/inst/reveal.js-5.2.1/css/theme/source/ids.scss b/inst/reveal.js-5.2.1/css/theme/source/ids.scss
index c55b95f..4691a64 100644
--- a/inst/reveal.js-5.2.1/css/theme/source/ids.scss
+++ b/inst/reveal.js-5.2.1/css/theme/source/ids.scss
@@ -224,10 +224,12 @@
 
 // The IDS logo stays a slide-wide watermark (top right of every slide,
 // including the title page). The SVG carries no internal padding of its own,
-// so it needs an explicit inset from the slide's right edge; the top offset is
-// chosen so the logo's cap line meets the top of the heading text.
-$idsLogoTop: 6px;
-$idsLogoRight: 8px;
+// so it needs an explicit inset from the slide's edges. That inset is shared
+// by everything that sits in a corner of the slide -- IDS (+ partner) logo
+// top right, website QR top left, funder logo bottom left, WGL membership
+// logo bottom right -- and is used for both edges of each corner, so all
+// four keep exactly the same distance to the slide's borders.
+$idsLogoInset: 8px;
 
 .reveal .slides {
   // Second layer: the optional partner institution logo (--partner-logo is
@@ -236,8 +238,8 @@
   background-image: url('https://corpora.ids-mannheim.de/slides/reveal.js.ids/images/IDS-Logo-2019.svg'),
     var(--partner-logo, none);
   background-repeat: no-repeat;
-  background-position: top #{$idsLogoTop} right #{$idsLogoRight},
-    top #{$idsLogoTop} right calc(#{$idsLogoRight} + var(--slide-height) * #{$idsLogoWidthRatio} + #{$idsPartnerGap});
+  background-position: top #{$idsLogoInset} right #{$idsLogoInset},
+    top #{$idsLogoInset} right calc(#{$idsLogoInset} + var(--slide-height) * #{$idsLogoWidthRatio} + #{$idsPartnerGap});
   background-size: calc(var(--slide-height) * #{$idsLogoWidthRatio}) auto,
     auto calc(var(--slide-height) * #{$idsPartnerHeightRatio});
 }
@@ -558,47 +560,51 @@
 // page in print view and cannot be hidden per page, position:fixed). Lift the
 // logo above the footer in print only; the screen layout stays put.
 html.reveal-print .reveal .slides section.title-frame {
-  background-position: right 8px bottom 55px;
+  background-position: right #{$idsLogoInset} bottom 55px;
 }
 
 // Like the orange bar/IDS logo above, this is painted on the slide itself
 // (rather than on .slide-background-content, which spans the raw,
 // unscaled viewport) so it stays pinned to the title slide's true
 // bottom-right corner instead of the browser window's. Its margin mirrors
-// the IDS logo's (top 6px / right 8px of the slide), so the two sit on
-// one shared inset.
+// the IDS logo's, so the two sit on one shared inset.
 .reveal .slides section.title-frame {
   background-image: url("https://corpora.ids-mannheim.de/slides/reveal.js.ids/images/Mitglied_WGL_transparent.svg");
   background-repeat: no-repeat;
-  background-position: right 8px bottom 10px;
+  background-position: right #{$idsLogoInset} bottom #{$idsLogoInset};
   background-size: calc(var(--slide-height) * 0.1) auto;
   /* full slide height, so "bottom" really is the slide's bottom edge */
   height: 100%;
 }
 
+// qrlink() codes placed anywhere else in a deck: qr_svg_fit() crops the svg
+// to the dark modules, so the quiet zone the code needs to stay scannable is
+// this padding (which also keeps a code readable on a dark background).
+.reveal a.qrcode {
+  display: inline-block;
+  padding: 0.5em;
+  background: #fff;
+}
+
 // Website QR code and funder logo on the title slide (document options
-// `website` and `funder_logo`): top-left and bottom-left corners. All
-// logos on the title slide keep the same distance to their respective
-// margins: top 6px / left 8px (QR), top 6px / right 8px (IDS [+ partner]
-// logo), bottom 10px / left 8px (funder), bottom 10px / right 8px (WGL
-// membership logo), so the four corners share one inset vocabulary. The QR
-// is sized generously (a quarter of the slide height) so it stays scannable
-// in all circumstances. Both are DOM elements injected into the title frame
-// by the pandoc template (the QR itself is generated in R by qrlink());
-// absolute positioning sticks to the slide, because reveal.js positions the
-// sections themselves.
+// `website` and `funder_logo`): top-left and bottom-left corners. Like the
+// two logos on the right, they keep $idsLogoInset to both slide edges --
+// measured to the visible ink, so that all four corners look alike. Both are
+// DOM elements injected into the title frame by the pandoc template (the QR
+// itself is generated in R by qrlink()); absolute positioning sticks to the
+// slide, because reveal.js positions the sections themselves.
+//
+// qrlink() crops the svg to the dark modules, so the quiet zone the code
+// needs to stay scannable is this white plate's padding -- which is also
+// what puts the modules themselves at $idsLogoInset from the slide's edges,
+// the plate sitting flush in the corner (invisible on the white slide).
 .reveal .slides section.title-frame .title-qr {
   position: absolute;
-  top: #{$idsLogoTop};
-  left: #{$idsLogoRight};
-  // The generated QR matrix has no quiet zone of its own (dark modules reach
-  // the svg edges), which makes it unscannable; the white plate's padding of
-  // ~4 modules supplies it. The plate's edge is also the element's visual
-  // boundary for the uniform corner insets, hence an outer size of 28% of
-  // the slide height minus the padding on two sides (~23% of pattern).
+  top: 0;
+  left: 0;
   box-sizing: border-box;
   width: calc(var(--slide-height) * 0.28);
-  padding: calc(var(--slide-height) * 0.025);
+  padding: #{$idsLogoInset};
   background: #fff;
 }
 
@@ -608,13 +614,18 @@
   width: 100%;
   height: auto;
   margin: 0;
+  // the quiet zone comes from the plate around it here
+  padding: 0;
 }
 
 .reveal .slides section.title-frame img.funder-logo {
   position: absolute;
-  left: #{$idsLogoRight};
-  bottom: 10px;
+  left: #{$idsLogoInset};
+  bottom: #{$idsLogoInset};
   height: calc(var(--slide-height) * 0.07);
+  // reveal.js gives images a vertical margin, which for an absolutely
+  // positioned one would add itself to the inset above.
+  margin: 0;
   width: auto;
 }