Slight visual improvements to warning boxes in the docs

src/librustdoc/html/static/rustdoc.css

@@ -858,6 +858,15 @@ body.blur > :not(#help) {
 	font-size: 1.5em;
 }
 
+/* Black one-pixel outline around emoji shapes */
+.emoji {
+	text-shadow:
+		1px 0 0 black,
+		-1px 0 0 black,
+		0  1px 0 black,
+		0 -1px 0 black;
+}
+
 .module-item .stab {
 	border-radius: 3px;
 	display: inline-block;

src/librustdoc/html/static/themes/dark.css

@@ -220,8 +220,8 @@ a.test-arrow {
 }
 
 .stab.unstable { background: #FFF5D6; border-color: #FFC600; color: #2f2f2f; }
-.stab.deprecated { background: #F3DFFF; border-color: #7F0087; color: #2f2f2f; }
-.stab.portability { background: #C4ECFF; border-color: #7BA5DB; color: #2f2f2f; }
+.stab.deprecated { background: #ffc4c4; border-color: #db7b7b; color: #2f2f2f; }
+.stab.portability { background: #F3DFFF; border-color: #b07bdb; color: #2f2f2f; }
 .stab.portability > code { background: none; }
 
 #help > div {

src/librustdoc/html/static/themes/light.css

@@ -218,8 +218,8 @@ a.test-arrow {
 }
 
 .stab.unstable { background: #FFF5D6; border-color: #FFC600; }
-.stab.deprecated { background: #F3DFFF; border-color: #7F0087; }
-.stab.portability { background: #C4ECFF; border-color: #7BA5DB; }
+.stab.deprecated { background: #ffc4c4; border-color: #db7b7b; }
+.stab.portability { background: #F3DFFF; border-color: #b07bdb; }
 .stab.portability > code { background: none; }
 
 #help > div {