【WordPress】 テーマ Twenty Seventeen で横幅を1500pxにし、Blogを1カラムにする

WordPressはyumで入れた(yum install wordpress)ので、 /usr/share/wordpress/wp-content/themes/twentyseventeen/style.css をごりごり書き換えた。

$ diff style.css /usr/share/wordpress/wp-content/themes/twentyseventeen/style.css -u
--- style.css   2018-04-28 13:05:27.000000000 +0900
+++ /usr/share/wordpress/wp-content/themes/twentyseventeen/style.css    2018-04-28 13:55:24.000000000 +0900
@@ -1319,7 +1319,7 @@
 }

 .navigation-top .wrap {
-       max-width: 1000px;
+       max-width: 1500px;
        padding: 0;
 }

@@ -2084,7 +2084,7 @@
 .archive.page-one-column:not(.has-sidebar) #primary {
        margin-left: auto;
        margin-right: auto;
-       max-width: 740px;
+       max-width: 1240px;
 }

 .single-featured-image-header {
@@ -3273,7 +3273,7 @@
        }

        .page-one-column .panel-content .wrap {
-               max-width: 740px;
+               max-width: 1240px;
        }

        .panel-content .entry-header {
@@ -3349,7 +3349,7 @@
        /* Layout */

        .wrap {
-               max-width: 1000px;
+               max-width: 1500px;
                padding-left: 3em;
                padding-right: 3em;
        }
@@ -3458,7 +3458,7 @@
        }

        .navigation-top .wrap {
-               max-width: 1000px;
+               max-width: 1500px;
                /* The font size is 14px here and we need 50px padding in ems */
                padding: 0.75em 3.4166666666667em;
        }
@@ -3822,8 +3822,8 @@
        body.has-sidebar.error404 #primary .page-header,
        body.page-two-column:not(.archive) #primary .entry-header,
        body.page-two-column.archive:not(.has-sidebar) #primary .page-header {
-               float: left;
-               width: 36%;
+               float: none;
+               width: 94%;
        }

        .blog:not(.has-sidebar) #primary article,
@@ -3833,8 +3833,8 @@
        .error404.has-sidebar #primary .page-content,
        body.page-two-column:not(.archive) #primary .entry-content,
        body.page-two-column #comments {
-               float: right;
-               width: 58%;
+               float: none;
+               width: 94%;
        }

        .blog .site-main > article,