From 903429824d3e30e994c929e125a00473cd348202 Mon Sep 17 00:00:00 2001
From: Miles Malerba <mmalerba@google.com>
Date: Thu, 5 Oct 2017 14:54:59 -0700
Subject: [PATCH] fix(form-field): fix underline at different zoom levels

---
 src/lib/form-field/form-field.scss | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lib/form-field/form-field.scss b/src/lib/form-field/form-field.scss
index a3e5bbf295d2..f91817b6c324 100644
--- a/src/lib/form-field/form-field.scss
+++ b/src/lib/form-field/form-field.scss
@@ -145,6 +145,8 @@ $mat-form-field-underline-height: 1px !default;
   position: absolute;
   height: $mat-form-field-underline-height;
   width: 100%;
+  // Prevents underline from disappearing at lower zoom levels.
+  transform: perspective(1px);
 
   &.mat-disabled {
     background-position: 0;