From 5cffd7c0e161f75e943054d0ea84e85cd6c4a70e Mon Sep 17 00:00:00 2001
From: mmalerba <mmalerba@google.com>
Date: Mon, 9 Oct 2017 15:49:17 -0700
Subject: [PATCH] fix(form-field): fix underline at different zoom levels
 (#7567)

---
 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 a3e5bbf295d..f91817b6c32 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;