diff -u b/core/themes/seven/style.css b/core/themes/seven/style.css
--- b/core/themes/seven/style.css
+++ b/core/themes/seven/style.css
@@ -723,7 +723,7 @@
   font-size: 1em;
   line-height: normal;
   margin: 0;
-  padding: .5em 1em;
+  padding: 0.2em 1em 0.3em;
   text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.5);
 }
 a.button.add:focus,
only in patch2:
unchanged:
--- a/core/modules/block/lib/Drupal/block/Tests/BlockTest.php
+++ b/core/modules/block/lib/Drupal/block/Tests/BlockTest.php
@@ -71,9 +71,11 @@ function testCustomBlock() {
 
     // Confirm that the add block link appears on block overview pages.
     $this->drupalGet('admin/structure/block');
-    $this->assertRaw(l('Add block', 'admin/structure/block/add'), 'Add block link is present on block overview page for default theme.');
+    $this->assertLink(t('Add block'));
+    $this->assertLinkByHref('admin/structure/block/add');
     $this->drupalGet('admin/structure/block/list/seven');
-    $this->assertRaw(l('Add block', 'admin/structure/block/list/seven/add'), 'Add block link is present on block overview page for non-default theme.');
+    $this->assertLink(t('Add block'));
+    $this->assertLinkByHref('admin/structure/block/list/seven/add');
 
     // Confirm that hidden regions are not shown as options for block placement
     // when adding a new block.