Update default border color and placeholder color in preflight (#2633)

Author: adamwathan

__tests__/fixtures/tailwind-output-flagged.css

@@ -398,7 +398,7 @@ html {
   box-sizing: border-box; /* 1 */
   border-width: 0; /* 2 */
   border-style: solid; /* 2 */
-  border-color: #d4d4d8; /* 2 */
+  border-color: #e4e4e7; /* 2 */
 }
 
 /*
@@ -429,7 +429,7 @@ textarea {
 
 input::placeholder,
 textarea::placeholder {
-  color: #a0aec0;
+  color: #a1a1aa;
 }
 
 button,

__tests__/fixtures/tailwind-output-important.css

@@ -398,7 +398,7 @@ html {
   box-sizing: border-box; /* 1 */
   border-width: 0; /* 2 */
   border-style: solid; /* 2 */
-  border-color: #d4d4d8; /* 2 */
+  border-color: #e4e4e7; /* 2 */
 }
 
 /*
@@ -429,7 +429,7 @@ textarea {
 
 input::placeholder,
 textarea::placeholder {
-  color: #a0aec0;
+  color: #a1a1aa;
 }
 
 button,

__tests__/fixtures/tailwind-output-no-color-opacity.css

@@ -398,7 +398,7 @@ html {
   box-sizing: border-box; /* 1 */
   border-width: 0; /* 2 */
   border-style: solid; /* 2 */
-  border-color: #d4d4d8; /* 2 */
+  border-color: #e4e4e7; /* 2 */
 }
 
 /*
@@ -429,7 +429,7 @@ textarea {
 
 input::placeholder,
 textarea::placeholder {
-  color: #a0aec0;
+  color: #a1a1aa;
 }
 
 button,

__tests__/fixtures/tailwind-output.css

@@ -398,7 +398,7 @@ html {
   box-sizing: border-box; /* 1 */
   border-width: 0; /* 2 */
   border-style: solid; /* 2 */
-  border-color: #d4d4d8; /* 2 */
+  border-color: #e4e4e7; /* 2 */
 }
 
 /*
@@ -429,7 +429,7 @@ textarea {
 
 input::placeholder,
 textarea::placeholder {
-  color: #a0aec0;
+  color: #a1a1aa;
 }
 
 button,

src/plugins/css/preflight.css

@@ -130,7 +130,7 @@ textarea {
 
 input::placeholder,
 textarea::placeholder {
-  color: #a0aec0;
+  color: theme('colors.gray.400', #a1a1aa);
 }
 
 button,

stubs/defaultConfig.stub.js

@@ -95,7 +95,7 @@ module.exports = {
     },
     borderColor: (theme) => ({
       ...theme('colors'),
-      DEFAULT: theme('colors.gray.300', 'currentColor'),
+      DEFAULT: theme('colors.gray.200', 'currentColor'),
     }),
     borderOpacity: (theme) => theme('opacity'),
     borderRadius: {