diff --git a/chrome/content/zotero/xpcom/uiProperties.js b/chrome/content/zotero/xpcom/uiProperties.js
index 285fbd3ea6..b909c0dc16 100644
--- a/chrome/content/zotero/xpcom/uiProperties.js
+++ b/chrome/content/zotero/xpcom/uiProperties.js
@@ -54,7 +54,9 @@ Zotero.UIProperties = new class {
 	
 	_setFontSize(root) {
 		let size = Zotero.Prefs.get('fontSize');
-		root.style.fontSize = root.style['--zotero-font-size'] = size + 'em';
+		let sizeCSS = size + 'rem';
+		root.style.fontSize = sizeCSS;
+		root.style.setProperty('--zotero-font-size', sizeCSS);
 		if (size <= 1) {
 			size = 'small';
 		}
diff --git a/scss/base/_base.scss b/scss/base/_base.scss
index 950e779e49..c7c881c5f8 100644
--- a/scss/base/_base.scss
+++ b/scss/base/_base.scss
@@ -6,6 +6,7 @@
     font-family: system-ui, -apple-system, sans-serif;
     font-size: 13px;
     font-style: normal;
+    line-height: 1.3333333333;
     @media (-moz-platform: windows) {
         --color-accent: var(--accent-blue);
         @include light-dark(--color-focus-border, #000, #fff);
diff --git a/scss/elements/_librariesCollectionsBox.scss b/scss/elements/_librariesCollectionsBox.scss
index 3062189973..bdd52be054 100644
--- a/scss/elements/_librariesCollectionsBox.scss
+++ b/scss/elements/_librariesCollectionsBox.scss
@@ -39,7 +39,6 @@ libraries-collections-box {
 				
 				.icon {
 					width: 16px;
-					height: 16px;
 				}
 			}