Add the correct font weight for b and strong

dist/milligram.css

@@ -6,6 +6,12 @@
  * Licensed under the MIT license
 */
 
+*,
+*:after,
+*:before {
+  box-sizing: inherit;
+}
+
 html {
   box-sizing: border-box;
   font-size: 62.5%;
@@ -20,12 +26,6 @@ body {
   line-height: 1.6;
 }
 
-*,
-*:after,
-*:before {
-  box-sizing: inherit;
-}
-
 blockquote {
   border-left: 0.3rem solid #d1d1d1;
   margin-left: 0;
@@ -525,6 +525,11 @@ th:last-child {
   padding-right: 0;
 }
 
+b,
+strong {
+  font-weight: bold;
+}
+
 p {
   margin-top: 0;
 }