added height auto to .login-page & .register-page

build/less/login_and_register.less

@@ -16,6 +16,7 @@
 
 .login-page,
 .register-page {
+  height: auto;
   background: @gray-lte;
 }
 

dist/css/AdminLTE.css

@@ -3259,6 +3259,7 @@ table.text-center th {
 }
 .login-page,
 .register-page {
+  height: auto;
   background: #d2d6de;
 }
 .login-box,

dist/css/alt/AdminLTE-without-plugins.css

@@ -3260,6 +3260,7 @@ table.text-center th {
 }
 .login-page,
 .register-page {
+  height: auto;
   background: #d2d6de;
 }
 .login-box,