tweak blurry bg for legibility & remove from modals (#1436)

src/components/Modal.scss

@@ -35,6 +35,10 @@
   animation: Modal__content_fade-in 0.1s ease-out 0.05s forwards;
   position: relative;
 
+  // for modals, reset blurry bg
+  background: #fff;
+  backdrop-filter: none;
+
   @media #{$media-query} {
     max-width: 100%;
   }