diff --git a/core/themes/classy/classy.libraries.yml b/core/themes/classy/classy.libraries.yml
index 5b934bf..7118f86 100644
--- a/core/themes/classy/classy.libraries.yml
+++ b/core/themes/classy/classy.libraries.yml
@@ -26,4 +26,4 @@ drupal.file:
   version: VERSION
   css:
     theme:
-      css/file/file.theme.css: {}
\ No newline at end of file
+      css/field/file.css: {}
diff --git a/core/themes/classy/css/field/file.css b/core/themes/classy/css/field/file.css
new file mode 100644
index 0000000..5e16b4f
--- /dev/null
+++ b/core/themes/classy/css/field/file.css
@@ -0,0 +1,62 @@
+/**
+ * @file
+ * Default style for file module.
+ */
+
+/* File icons.*/
+
+.file {
+  padding-left: 20px; /* LTR */
+  display: inline-block;
+  min-height: 16px;
+  background-repeat: no-repeat;
+  background-position: left center; /* LTR */
+}
+[dir="rtl"] .file {
+  padding-left: inherit;
+  padding-right: 20px;
+  background-position: right center;
+}
+.file--general,
+.file--application-octet-stream {
+  background-image: url(../../images/icons/application-octet-stream.png);
+}
+.file--package-x-generic {
+  background-image: url(../../images/icons/package-x-generic.png);
+}
+.file--x-office-spreadsheet {
+  background-image: url(../../images/icons/x-office-spreadsheet.png);
+}
+.file--x-office-document {
+  background-image: url(../../images/icons/x-office-document.png);
+}
+.file--x-office-presentation {
+  background-image: url(../../images/icons/x-office-presentation.png);
+}
+.file--text-x-script {
+  background-image: url(../../images/icons/text-x-script.png);
+}
+.file--text-html {
+  background-image: url(../../images/icons/text-html.png);
+}
+.file--text-plain {
+  background-image: url(../../images/icons/text-plain.png);
+}
+.file--application-pdf {
+  background-image: url(../../images/icons/application-pdf.png);
+}
+.file--application-x-executable {
+  background-image: url(../../images/icons/application-x-executable.png);
+}
+.file--audio {
+  background-image: url(../../images/icons/audio-x-generic.png);
+}
+.file--video {
+  background-image: url(../../images/icons/video-x-generic.png);
+}
+.file--text {
+  background-image: url(../../images/icons/text-x-generic.png);
+}
+.file--image {
+  background-image: url(../../images/icons/image-x-generic.png);
+}
diff --git a/core/themes/classy/css/file/file.theme.css b/core/themes/classy/css/file/file.theme.css
deleted file mode 100644
index 45f30a9..0000000
--- a/core/themes/classy/css/file/file.theme.css
+++ /dev/null
@@ -1,62 +0,0 @@
-/**
- * @file
- * Default style for file module.
- */
-
-/* File icons.*/
-
-.file {
-  padding-left: 20px; /* LTR */
-  display: inline-block;
-  min-height: 16px;
-  background-repeat: no-repeat;
-  background-position: left center; /* LTR */
-}
-[dir="rtl"] .file {
-  padding-left: inherit;
-  padding-right: 20px;
-  background-position: right center;
-}
-.file--general,
-.file--application-octet-stream {
-  background-image: url(../../images/fileicons/application-octet-stream.png);
-}
-.file--package-x-generic {
-  background-image: url(../../images/fileicons/package-x-generic.png);
-}
-.file--x-office-spreadsheet {
-  background-image: url(../../images/fileicons/x-office-spreadsheet.png);
-}
-.file--x-office-document {
-  background-image: url(../../images/fileicons/x-office-document.png);
-}
-.file--x-office-presentation {
-  background-image: url(../../images/fileicons/x-office-presentation.png);
-}
-.file--text-x-script {
-  background-image: url(../../images/fileicons/text-x-script.png);
-}
-.file--text-html {
-  background-image: url(../../images/fileicons/text-html.png);
-}
-.file--text-plain {
-  background-image: url(../../images/fileicons/text-plain.png);
-}
-.file--application-pdf {
-  background-image: url(../../images/fileicons/application-pdf.png);
-}
-.file--application-x-executable {
-  background-image: url(../../images/fileicons/application-x-executable.png);
-}
-.file--audio {
-  background-image: url(../../images/fileicons/audio-x-generic.png);
-}
-.file--video {
-  background-image: url(../../images/fileicons/video-x-generic.png);
-}
-.file--text {
-  background-image: url(../../images/fileicons/text-x-generic.png);
-}
-.file--image {
-  background-image: url(../../images/fileicons/image-x-generic.png);
-}
diff --git a/core/themes/classy/css/form/button.css b/core/themes/classy/css/form/button.css
new file mode 100644
index 0000000..af6a753
--- /dev/null
+++ b/core/themes/classy/css/form/button.css
@@ -0,0 +1,15 @@
+/**
+ * @file
+ * Visual styles for buttons.
+ */
+
+.button,
+.image-button {
+  margin-left: 1em;
+  margin-right: 1em;
+}
+.button:first-child,
+.image-button:first-child {
+  margin-left: 0;
+  margin-right: 0;
+}
diff --git a/core/themes/classy/css/navigation/action-links.css b/core/themes/classy/css/navigation/action-links.css
new file mode 100644
index 0000000..8ba7e60
--- /dev/null
+++ b/core/themes/classy/css/navigation/action-links.css
@@ -0,0 +1,43 @@
+/**
+ * @file
+ * Styles for link buttons and action links.
+ */
+
+.action-links {
+  list-style: none;
+  padding: 0;
+  margin: 1em 0;
+}
+[dir="rtl"] .action-links {
+  /* This is required to win over specificity of [dir="rtl"] ul */
+  margin-right: 0;
+}
+.action-links li {
+  display: inline-block;
+  margin: 0 0.3em;
+}
+.action-links li:first-child {
+  margin-left: 0; /* LTR */
+}
+[dir="rtl"] .action-links li:first-child {
+  margin-left: 0.3em;
+  margin-right: 0;
+}
+.button-action {
+  display: inline-block;
+  line-height: 160%;
+  padding: 0.2em 0.5em 0.3em;
+  text-decoration: none;
+}
+.button-action:before {
+  content: '+';
+  font-weight: 900;
+  margin-left: -0.1em; /* LTR */
+  padding-right: 0.2em; /* LTR */
+}
+[dir="rtl"] .button-action:before {
+  margin-left: 0;
+  margin-right: -0.1em;
+  padding-left: 0.2em;
+  padding-right: 0;
+}
diff --git a/core/themes/classy/css/navigation/breadcrumb.css b/core/themes/classy/css/navigation/breadcrumb.css
new file mode 100644
index 0000000..465593e
--- /dev/null
+++ b/core/themes/classy/css/navigation/breadcrumb.css
@@ -0,0 +1,29 @@
+/**
+ * @file
+ * Styles for breadcrumbs.
+ */
+
+.breadcrumb {
+  padding-bottom: 0.5em;
+}
+.breadcrumb ol {
+  margin: 0;
+  padding: 0;
+}
+[dir="rtl"] .breadcrumb ol {
+  /* This is required to win over specificity of [dir="rtl"] ol */
+  margin-right: 0;
+}
+.breadcrumb li {
+  display: inline;
+  list-style-type: none;
+  margin: 0;
+  padding: 0;
+}
+/* IE8 does not support :not() and :last-child. */
+.breadcrumb li:before {
+  content: ' \BB ';
+}
+.breadcrumb li:first-child:before {
+  content: none;
+}
diff --git a/core/themes/classy/images/fileicons/application-octet-stream.png b/core/themes/classy/images/icons/application-octet-stream.png
similarity index 100%
rename from core/themes/classy/images/fileicons/application-octet-stream.png
rename to core/themes/classy/images/icons/application-octet-stream.png
diff --git a/core/themes/classy/images/fileicons/application-pdf.png b/core/themes/classy/images/icons/application-pdf.png
similarity index 100%
rename from core/themes/classy/images/fileicons/application-pdf.png
rename to core/themes/classy/images/icons/application-pdf.png
diff --git a/core/themes/classy/images/fileicons/application-x-executable.png b/core/themes/classy/images/icons/application-x-executable.png
similarity index 100%
rename from core/themes/classy/images/fileicons/application-x-executable.png
rename to core/themes/classy/images/icons/application-x-executable.png
diff --git a/core/themes/classy/images/fileicons/audio-x-generic.png b/core/themes/classy/images/icons/audio-x-generic.png
similarity index 100%
rename from core/themes/classy/images/fileicons/audio-x-generic.png
rename to core/themes/classy/images/icons/audio-x-generic.png
diff --git a/core/themes/classy/images/fileicons/image-x-generic.png b/core/themes/classy/images/icons/image-x-generic.png
similarity index 100%
rename from core/themes/classy/images/fileicons/image-x-generic.png
rename to core/themes/classy/images/icons/image-x-generic.png
diff --git a/core/themes/classy/images/fileicons/package-x-generic.png b/core/themes/classy/images/icons/package-x-generic.png
similarity index 100%
rename from core/themes/classy/images/fileicons/package-x-generic.png
rename to core/themes/classy/images/icons/package-x-generic.png
diff --git a/core/themes/classy/images/fileicons/text-html.png b/core/themes/classy/images/icons/text-html.png
similarity index 100%
rename from core/themes/classy/images/fileicons/text-html.png
rename to core/themes/classy/images/icons/text-html.png
diff --git a/core/themes/classy/images/fileicons/text-plain.png b/core/themes/classy/images/icons/text-plain.png
similarity index 100%
rename from core/themes/classy/images/fileicons/text-plain.png
rename to core/themes/classy/images/icons/text-plain.png
diff --git a/core/themes/classy/images/fileicons/text-x-generic.png b/core/themes/classy/images/icons/text-x-generic.png
similarity index 100%
rename from core/themes/classy/images/fileicons/text-x-generic.png
rename to core/themes/classy/images/icons/text-x-generic.png
diff --git a/core/themes/classy/images/fileicons/text-x-script.png b/core/themes/classy/images/icons/text-x-script.png
similarity index 100%
rename from core/themes/classy/images/fileicons/text-x-script.png
rename to core/themes/classy/images/icons/text-x-script.png
diff --git a/core/themes/classy/images/fileicons/video-x-generic.png b/core/themes/classy/images/icons/video-x-generic.png
similarity index 100%
rename from core/themes/classy/images/fileicons/video-x-generic.png
rename to core/themes/classy/images/icons/video-x-generic.png
diff --git a/core/themes/classy/images/fileicons/x-office-document.png b/core/themes/classy/images/icons/x-office-document.png
similarity index 100%
rename from core/themes/classy/images/fileicons/x-office-document.png
rename to core/themes/classy/images/icons/x-office-document.png
diff --git a/core/themes/classy/images/fileicons/x-office-presentation.png b/core/themes/classy/images/icons/x-office-presentation.png
similarity index 100%
rename from core/themes/classy/images/fileicons/x-office-presentation.png
rename to core/themes/classy/images/icons/x-office-presentation.png
diff --git a/core/themes/classy/images/fileicons/x-office-spreadsheet.png b/core/themes/classy/images/icons/x-office-spreadsheet.png
similarity index 100%
rename from core/themes/classy/images/fileicons/x-office-spreadsheet.png
rename to core/themes/classy/images/icons/x-office-spreadsheet.png