Fix autosuggest-textarea backgrounds and some minor adjustments (#7817)

app/javascript/styles/mastodon-light/diff.scss

@@ -25,7 +25,10 @@
   background: $ui-base-color url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 234.80078 31.757813" width="234.80078" height="31.757812"><path d="M19.599609 0c-1.05 0-2.10039.375-2.90039 1.125L0 16.925781v14.832031h234.80078V17.025391l-16.5-15.900391c-1.6-1.5-4.20078-1.5-5.80078 0l-13.80078 13.099609c-1.6 1.5-4.19883 1.5-5.79883 0L179.09961 1.125c-1.6-1.5-4.19883-1.5-5.79883 0L159.5 14.224609c-1.6 1.5-4.20078 1.5-5.80078 0L139.90039 1.125c-1.6-1.5-4.20078-1.5-5.80078 0l-13.79883 13.099609c-1.6 1.5-4.20078 1.5-5.80078 0L100.69922 1.125c-1.600001-1.5-4.198829-1.5-5.798829 0l-13.59961 13.099609c-1.6 1.5-4.200781 1.5-5.800781 0L61.699219 1.125c-1.6-1.5-4.198828-1.5-5.798828 0L42.099609 14.224609c-1.6 1.5-4.198828 1.5-5.798828 0L22.5 1.125C21.7.375 20.649609 0 19.599609 0z" fill="#{hex-color($white)}"/></svg>') no-repeat bottom / 100% auto;
 }
 
-.compose-form .compose-form__modifiers .compose-form__upload__actions .icon-button {
+// Change the colors used in compose-form
+.compose-form {
+  .compose-form__modifiers {
+    .compose-form__upload__actions .icon-button {
       color: lighten($white, 7%);
 
       &:active,
@@ -35,23 +38,38 @@
       }
     }
 
-.compose-form .compose-form__modifiers .compose-form__upload-description input {
+    .compose-form__upload-description input {
       color: lighten($white, 7%);
 
       &::placeholder {
         color: lighten($white, 7%);
       }
     }
+  }
 
-.compose-form .compose-form__buttons-wrapper {
+  .compose-form__buttons-wrapper {
     background: darken($ui-base-color, 6%);
   }
 
+  .autosuggest-textarea__suggestions {
+    background: darken($ui-base-color, 6%);
+  }
+
+  .autosuggest-textarea__suggestions__item {
+    &:hover,
+    &:focus,
+    &:active,
+    &.selected {
+      background: lighten($ui-base-color, 4%);
+    }
+  }
+}
+
 .emoji-mart-bar {
-  border-color: lighten($ui-base-color, 8%);
+  border-color: lighten($ui-base-color, 4%);
 
   &:first-child {
-    background: $ui-base-color;
+    background: darken($ui-base-color, 6%);
   }
 }
 
@@ -60,6 +78,7 @@
   border-color: $ui-base-color;
 }
 
+// Change the background colors of statuses
 .focusable:focus {
   background: $ui-base-color;
 }
@@ -77,7 +96,7 @@
   background: darken($ui-base-color, 6%);
 }
 
-// Change the background color of status__content__spoiler-link
+// Change the background colors of status__content__spoiler-link
 .reply-indicator__content .status__content__spoiler-link,
 .status__content .status__content__spoiler-link {
   background: $ui-base-lighter-color;
@@ -87,8 +106,7 @@
   }
 }
 
-// Change the background colors of media and video spoiler
-
+// Change the background colors of media and video spoilers
 .media-spoiler,
 .video-player__spoiler {
   background: $ui-base-color;
@@ -101,9 +119,8 @@
 // Change the colors used in the dropdown menu
 .dropdown-menu {
   background: $ui-base-color;
-}
 
-.dropdown-menu__arrow {
+  &__arrow {
     &.left {
       border-left-color: $ui-base-color;
     }
@@ -121,12 +138,13 @@
     }
   }
 
-.dropdown-menu__item {
+  &__item {
     a {
       background: $ui-base-color;
       color: $darker-text-color;
     }
   }
+}
 
 // Change the text colors on inverted background
 .privacy-dropdown__option.active .privacy-dropdown__option__content,