fix(scss/global): Inherit colors for input and textarea (#541)

scss/global.scss

@@ -82,6 +82,12 @@ input {
   box-sizing: border-box;
 }
 
+// Fixes gray/black background when using a dark GTK theme
+input, textarea {
+  background: inherit;
+  color: inherit;
+}
+
 button, .button {
   font-size: 1.2em;
   background: var(--button-bg);
@@ -205,4 +211,4 @@ textarea {
   margin: -0.1em 0;
   object-fit: contain;
   vertical-align: middle;
-}
+}