adjust .link-growi-org and .btn-fill colors

src/client/styles/scss/_login.scss

@@ -134,26 +134,12 @@
   .link-growi-org {
     font-size: smaller;
     font-weight: bold;
-    color: rgba(black, 0.4);
 
     &,
     .growi,
     .org {
       transition: color 0.8s;
     }
-
-    &:hover,
-    &.focus {
-      color: black;
-
-      .growi {
-        color: darken($growi-green, 20%);
-      }
-
-      .org {
-        color: darken($growi-blue, 15%);
-      }
-    }
   }
 
   .link-switch {
@@ -179,7 +165,7 @@
   .link-growi-org {
     position: absolute;
     bottom: 9px;
-    z-index: 2;
+    z-index: 3;
   }
 
   // To adjust the behavior, this problem is not solved.

src/client/styles/scss/theme/_apply-colors-dark.scss

@@ -138,6 +138,33 @@ ul.pagination {
       }
     }
   }
+
+  .btn-fill {
+    .btn-label {
+      color: #ccc;
+    }
+    .btn-label-text {
+      color: #aaa;
+    }
+  }
+
+  // footer link text
+  .link-growi-org {
+    color: rgba(white, 0.4);
+
+    &:hover,
+    &.focus {
+      color: rgba(white, 0.7);
+
+      .growi {
+        color: darken($growi-green, 5%);
+      }
+
+      .org {
+        color: darken($growi-blue, 5%);
+      }
+    }
+  }
 }
 
 /*

src/client/styles/scss/theme/_apply-colors-light.scss

@@ -81,6 +81,24 @@ $table-hover-bg: $bgcolor-table-hover;
       }
     }
   }
+
+  // footer link text
+  .link-growi-org {
+    color: rgba(black, 0.4);
+
+    &:hover,
+    &.focus {
+      color: black;
+
+      .growi {
+        color: darken($growi-green, 20%);
+      }
+
+      .org {
+        color: darken($growi-blue, 15%);
+      }
+    }
+  }
 }
 
 /*