[Glitch] Fix placeholder colors for inputs not being explicitly defined

Port b6df9c1067 to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/styles/components/accounts.scss

@@ -245,6 +245,28 @@
   .column-select {
     &__control {
       @include search-input();
+
+      &::placeholder {
+        color: lighten($darker-text-color, 4%);
+      }
+
+      &::-moz-focus-inner {
+        border: 0;
+      }
+
+      &::-moz-focus-inner,
+      &:focus,
+      &:active {
+        outline: 0 !important;
+      }
+
+      &:focus {
+        background: lighten($ui-base-color, 4%);
+      }
+
+      @media screen and (max-width: 600px) {
+        font-size: 16px;
+      }
     }
 
     &__placeholder {