Rollup merge of rust-lang#79936 - GuillaumeGomez:mobile-fix-item-name…

…, r=Nemo157,jyn514

Fix item name display on mobile

Fixes rust-lang/docs.rs#1200

![Screenshot_20201211-200931](https://user-images.githubusercontent.com/3050060/101944457-0c06eb00-3bed-11eb-8f63-a4d4fd3cbb56.jpg)
![Screenshot_20201211-195846](https://user-images.githubusercontent.com/3050060/101944459-0d381800-3bed-11eb-91ff-815a2af7ca72.jpg)

cc `@jyn514`

r? `@Nemo157`

src/librustdoc/html/static/rustdoc.css

@@ -1570,9 +1570,13 @@ h4 > .notable-traits {
 		height: 73px;
 	}
 
+	#main {
+		margin-top: 100px;
+	}
+
 	#main > table:not(.table-display) td {
 		word-break: break-word;
-		min-width: 10%;
+		width: 50%;
 	}
 
 	.search-container > div {