Update to reveal.js 4.6.1
Change-Id: I566737c50b93dd8c094ad3c3fa59865260b3b4ba
diff --git a/inst/reveal.js-4.6.1/css/layout.scss b/inst/reveal.js-4.6.1/css/layout.scss
new file mode 100644
index 0000000..f499fdd
--- /dev/null
+++ b/inst/reveal.js-4.6.1/css/layout.scss
@@ -0,0 +1,69 @@
+/**
+ * Layout helpers.
+ */
+
+// Stretch an element vertically based on available space
+.reveal .stretch,
+.reveal .r-stretch {
+ max-width: none;
+ max-height: none;
+}
+
+.reveal pre.stretch code,
+.reveal pre.r-stretch code {
+ height: 100%;
+ max-height: 100%;
+ box-sizing: border-box;
+}
+
+// Text that auto-fits its container
+.reveal .r-fit-text {
+ display: inline-block; // https://github.com/rikschennink/fitty#performance
+ white-space: nowrap;
+}
+
+// Stack multiple elements on top of each other
+.reveal .r-stack {
+ display: grid;
+}
+
+.reveal .r-stack > * {
+ grid-area: 1/1;
+ margin: auto;
+}
+
+// Horizontal and vertical stacks
+.reveal .r-vstack,
+.reveal .r-hstack {
+ display: flex;
+
+ img, video {
+ min-width: 0;
+ min-height: 0;
+ object-fit: contain;
+ }
+}
+
+.reveal .r-vstack {
+ flex-direction: column;
+ align-items: center;
+ justify-content: center;
+}
+
+.reveal .r-hstack {
+ flex-direction: row;
+ align-items: center;
+ justify-content: center;
+}
+
+// Naming based on tailwindcss
+.reveal .items-stretch { align-items: stretch; }
+.reveal .items-start { align-items: flex-start; }
+.reveal .items-center { align-items: center; }
+.reveal .items-end { align-items: flex-end; }
+
+.reveal .justify-between { justify-content: space-between; }
+.reveal .justify-around { justify-content: space-around; }
+.reveal .justify-start { justify-content: flex-start; }
+.reveal .justify-center { justify-content: center; }
+.reveal .justify-end { justify-content: flex-end; }