Dark Mode: Remove --ui-white (#14162)

ui/css/design-system/colors.scss

@@ -56,7 +56,6 @@ $color-map: (
   'ui-3': --ui-3,
   'ui-4': --ui-4,
   'ui-5': --ui-5,
-  'white': --ui-white,
   'grey': --ui-grey,
   'neutral-grey': --neutral-grey,
   'primary-3': --primary-3,

ui/css/utilities/colors.scss

@@ -7,7 +7,6 @@
   --success-1: #4cd964;
   --success-3: #219e37;
   --ui-grey: #d6d9dc;
-  --ui-white: #fff;
   --ui-1: #f2f3f4;
   --ui-2: #d6d9dc;
   --ui-3: #bbc0c5;

ui/pages/swaps/loading-swaps-quotes/index.scss

@@ -89,37 +89,6 @@
     width: 316px;
   }
 
-  &__logo {
-    position: fixed;
-
-    &--transition {
-      -webkit-transition: opacity 0.4s linear;
-      -moz-transition: opacity 0.4s linear;
-      -ms-transition: opacity 0.4s linear;
-      -o-transition: opacity 0.4s linear;
-      transition: opacity 0.4s linear;
-    }
-
-    div {
-      height: 40px;
-      width: 94px;
-      border-radius: 50px;
-      display: flex;
-      justify-content: center;
-      align-items: center;
-      background: var(--ui-black);
-    }
-
-    img {
-      width: 74px;
-      height: 30px;
-    }
-
-    span {
-      color: var(--ui-white);
-    }
-  }
-
   &__loading-bar-container {
     width: 248px;
     height: 3px;