Add missing CSS rules for associated types

Author: GuillaumeGomez

src/librustdoc/html/static/rustdoc.css

@@ -110,7 +110,7 @@ h3 {
 	font-size: 1.3em;
 }
 h1, h2, h3:not(.impl):not(.method):not(.type):not(.tymethod):not(.notable),
-h4:not(.method):not(.type):not(.tymethod):not(.associatedconstant) {
+h4:not(.method):not(.type):not(.tymethod):not(.associatedconstant):not(.associatedtype) {
 	font-weight: 500;
 	margin: 20px 0 15px 0;
 	padding-bottom: 6px;
@@ -128,18 +128,18 @@ h1.fqn > .in-band > a:hover {
 	text-decoration: underline;
 }
 h2, h3:not(.impl):not(.method):not(.type):not(.tymethod),
-h4:not(.method):not(.type):not(.tymethod):not(.associatedconstant) {
+h4:not(.method):not(.type):not(.tymethod):not(.associatedconstant):not(.associatedtype) {
 	border-bottom: 1px solid;
 }
-h3.impl, h3.method, h4.method, h3.type, h4.type, h4.associatedconstant {
+h3.impl, h3.method, h4.method, h3.type, h4.type, h4.associatedconstant, h4.associatedtype {
 	flex-basis: 100%;
 	font-weight: 600;
 	margin-top: 16px;
 	margin-bottom: 10px;
 	position: relative;
 }
 h3.impl, h3.method, h4.method.trait-impl, h3.type,
-h4.type.trait-impl, h4.associatedconstant.trait-impl {
+h4.type.trait-impl, h4.associatedconstant.trait-impl, h4.associatedtype.trait-impl {
 	padding-left: 15px;
 }
 
@@ -599,8 +599,9 @@ h4 > code, h3 > code, .invisible > code {
 }
 
 .content .impl-items .method, .content .impl-items > .type, .impl-items > .associatedconstant,
-.content .impl-items details > summary > .type,
-.impl-items details > summary > .associatedconstant {
+.impl-items > .associatedtype, .content .impl-items details > summary > .type,
+.impl-items details > summary > .associatedconstant,
+.impl-items details > summary > .associatedtype {
 	margin-left: 20px;
 }
 
@@ -660,7 +661,8 @@ a {
 }
 
 .in-band:hover > .anchor, .impl:hover > .anchor, .method.trait-impl:hover > .anchor,
-.type.trait-impl:hover > .anchor, .associatedconstant.trait-impl:hover > .anchor {
+.type.trait-impl:hover > .anchor, .associatedconstant.trait-impl:hover > .anchor,
+.associatedtype.trait-impl:hover > .anchor {
 	display: inline-block;
 	position: absolute;
 }
@@ -1470,7 +1472,8 @@ h4 > .notable-traits {
 		margin-left: 0;
 	}
 
-	.content .impl-items .method, .content .impl-items > .type, .impl-items > .associatedconstant {
+	.content .impl-items .method, .content .impl-items > .type, .impl-items > .associatedconstant,
+	.impl-items > .associatedtype {
 		display: flex;
 	}