fix loginform linkcolor

packages/app/src/styles/theme/_apply-colors-dark.scss

@@ -178,6 +178,13 @@
     .nologin-header {
       background-color: rgba(black, 0.5);
 
+      a {
+        color: #7b9bd5;
+        @include hover() {
+          color: lighten(#7b9bd5,10%);
+        }
+      }
+
       .logo {
         background-color: rgba(white, 0);
         fill: rgba(white, 0.5);

packages/app/src/styles/theme/_apply-colors-light.scss

@@ -98,6 +98,13 @@
       linear-gradient(135deg, var.$growi-green 10%, hsla(225, 95%, 50%, 0) 70%), linear-gradient(225deg, var.$growi-blue 10%, hsla(140, 90%, 50%, 0) 80%),
       linear-gradient(315deg, darken($color-gradient, 25%) 100%, hsla(35, 95%, 55%, 0) 70%);
 
+    a {
+      color: #1939b8;
+      @include hover() {
+        color: lighten(#1939b8,20%);
+      }
+    }
+
     .nologin-header {
       background-color: rgba(white, 0.5);
 

packages/preset-themes/src/styles/antarctic.scss

@@ -161,8 +161,7 @@
 
   // login and register
   .nologin {
-    a#login.link-switch,
-    a#register.link-switch {
+    a {
       color: rgba(black, 0.5);
     }