diff --git a/client/components/Tooltip.css b/client/components/Tooltip.css
index 732ad61a..5c72c1b9 100644
--- a/client/components/Tooltip.css
+++ b/client/components/Tooltip.css
@@ -5,7 +5,7 @@
   border-radius: 4px;
   background: #fff;
   border: 1px solid #aaa;
-  opacity: 0.7;
+  opacity: 0.9;
   white-space: nowrap;
   visibility: visible;
   transition: opacity .2s ease, visibility .2s ease;
diff --git a/client/viewer.css b/client/viewer.css
index e4cb0ea7..f10404d8 100644
--- a/client/viewer.css
+++ b/client/viewer.css
@@ -1,5 +1,5 @@
 :root {
-  --main-font: normal 11px Verdana;
+  --main-font: normal 11px Verdana, sans-serif;
 }
 
 :global html,