Working around some glitching when page was scrolled.

src/components/Options/style.scss

@@ -54,4 +54,5 @@ $horizontalPadding: 15px;
 .options-scroller {
   overflow-x: hidden;
   overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
 }

src/components/intro/style.scss

@@ -19,7 +19,6 @@
 }
 
 .intro {
-  composes: abs-fill from '../../lib/util.scss';
   display: grid;
   grid-template-rows: 1fr min-content;
   align-items: center;
@@ -29,6 +28,9 @@
   -webkit-overflow-scrolling: touch;
   overflow: auto;
   padding: 20px 0 0;
+  height: 100%;
+  box-sizing: border-box;
+  overscroll-behavior: contain;
 }
 
 .logo-container {

src/style/index.scss

@@ -2,7 +2,6 @@
 
 html, body {
   height: 100%;
-  width: 100%;
   padding: 0;
   margin: 0;
   font: 12px/1.3 system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, sans-serif;