diff --git a/core/themes/seven/css/theme/ckeditor-dialog.css b/core/themes/seven/css/theme/ckeditor-dialog.css
new file mode 100644
index 0000000..effde22
--- /dev/null
+++ b/core/themes/seven/css/theme/ckeditor-dialog.css
@@ -0,0 +1,195 @@
+.cke_dialog_background_cover {
+  display: none;
+}
+.cke_dialog:before {
+  content: '';
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  background: #000;
+  opacity: .70;
+  filter: Alpha(Opacity=70);
+}
+.cke_reset_all .cke_dialog_body {
+  position: relative;
+  border: 0;
+  border-radius: 0;
+  background: none;
+}
+.cke_reset_all .cke_dialog_body * {
+  font: 13px/1.538em "Lucida Grande","Lucida Sans Unicode","DejaVu Sans","Lucida Sans",sans-serif;
+}
+.cke_reset_all .cke_dialog_title {
+  padding: 15px 49px 15px 15px;
+  border: 0;
+  border-top-left-radius: 5px;
+  border-top-right-radius: 5px;
+  font-size: 1.231em;
+  line-height: 1.25em;
+  font-weight: 600;
+  background: #6b6b6b;
+  color: #fff;
+  box-shadow: none;
+  text-shadow: none;
+}
+.cke_reset_all a.cke_dialog_close_button {
+  top: 16px;
+  right: 20px;
+  width: 16px;
+  height: 16px;
+  background: url(/core/misc/icons/ffffff/ex.svg) 0 0 no-repeat;
+  opacity: 1;
+}
+.cke_reset_all .cke_dialog_contents_body {
+  padding: 1em;
+}
+.cke_reset_all tr:hover,
+.cke_reset_all tr:focus {
+  background: none;
+}
+.cke_reset_all .cke_dialog_body label {
+  display: table;
+  margin: 0 0 0.1em;
+  padding: 0;
+  font-weight: bold;
+}
+.cke_reset_all .cke_dialog_body textarea,
+.cke_reset_all .cke_dialog_body input[type="text"],
+.cke_reset_all .cke_dialog_body input[type="password"],
+.cke_reset_all select.cke_dialog_ui_input_select {
+  box-sizing: border-box;
+  max-width: 100%;
+  margin: 0 0 3px;
+  padding: .3em .4em .3em .5em;
+  border: 1px solid #b8b8b8;
+  border-top-color: #999;
+  border-radius: 2px;
+  font-size: 1em;
+  line-height: normal;
+  background: #fcfcfa;
+  color: #595959;
+  box-shadow: inset 0 1px 2px rgba(0,0,0,.125);
+  -webkit-transition: border linear 0.2s,box-shadow linear 0.2s;
+  transition: border linear 0.2s,box-shadow linear 0.2s;
+}
+.cke_reset_all select.cke_dialog_ui_input_select {
+  padding-right: 1.5em;
+  background: #fcfcfa url(/core/misc/icons/333333/caret-down.svg) no-repeat 99% 63%;
+}
+.cke_reset_all .cke_dialog_body textarea:focus,
+.cke_reset_all .cke_dialog_body input[type="text"]:focus,
+.cke_reset_all .cke_dialog_body input[type="password"]:focus,
+.cke_reset_all select.cke_dialog_ui_input_select:focus {
+  border-color: #40b6ff;
+  outline: 0;
+  box-shadow: inset 0 1px 3px rgba(0,0,0,.05),0 0 8px #40b6ff;
+  background-color: #fff;
+}
+.cke_reset_all .cke_dialog_footer {
+  margin: 0;
+  padding: 15px 20px;
+  border-bottom-left-radius: 5px;
+  border-bottom-right-radius: 5px;
+  outline: none;
+  text-align: left;
+  background: #f5f5f2;
+}
+.cke_reset_all .cke_resizer {
+  display: none;
+}
+.cke_reset_all .cke_dialog_footer_buttons {
+  margin: 0;
+}
+.cke_dialog_footer_buttons td {
+  float: right;
+}
+.cke_reset_all a.cke_dialog_ui_button {
+  position: relative;
+  box-sizing: border-box;
+  display: inline-block;
+  margin-right: 1em;
+  padding: 4px 1.5em;
+  border: 1px solid #a6a6a6;
+  border-radius: 20em;
+  text-align: center;
+  font-weight: 600;
+  font-size: 14px;
+  font-size: 0.875rem;
+  line-height: normal;
+  background-color: #f2f1eb;
+  background-image: -webkit-linear-gradient(top,#f6f6f3,#e7e7df);
+  background-image: linear-gradient(to bottom,#f6f6f3,#e7e7df);
+  color: #333;
+  text-decoration: none;
+  text-shadow: 0 1px hsla(0,0%,100%,0.6);
+  cursor: pointer;
+  -webkit-appearance: none;
+  -moz-appearance: none;
+  -webkit-transition: all 0.1s;
+  transition: all 0.1s;
+  -webkit-font-smoothing: antialiased;
+}
+.cke_reset_all a.cke_dialog_ui_button:hover,
+.cke_reset_all a.cke_dialog_ui_button:focus {
+  background-color: #f9f8f6;
+  background-image: -webkit-linear-gradient(top,#fcfcfa,#e9e9dd);
+  background-image: linear-gradient(to bottom,#fcfcfa,#e9e9dd);
+  color: #1a1a1a;
+  text-decoration: none;
+  box-shadow: 0 1px 2px hsla(0,0%,0%,0.125)
+}
+.cke_reset_all a.cke_dialog_ui_button:focus {
+  z-index: 10;
+  padding: 4px 1.5em;
+  border: 1px solid #3AB2FF;
+  box-shadow: 0 0 0.5em 0.1em hsla(203,100%,60%,0.7);
+}
+.cke_reset_all a.cke_dialog_ui_button:active {
+  padding: 4px 1.5em;
+  border: 1px solid #a6a6a6;
+  background-color: #dfdfd9;
+  background-image: -webkit-linear-gradient(top,#f6f6f3,#e7e7df);
+  background-image: linear-gradient(to bottom,#f6f6f3,#e7e7df);
+  box-shadow: inset 0 1px 3px hsla(0,0%,0%,0.2);
+  -webkit-transition: none;
+  transition: none;
+}
+.cke_reset_all .cke_dialog_footer_buttons a.cke_dialog_ui_button span {
+  padding: 0;
+  font-size: 0.875rem;
+  text-shadow: 0 1px hsla(0,0%,100%,0.6);
+}
+.cke_reset_all a.cke_dialog_ui_button_ok {
+  border-color: #1e5c90;
+  font-weight: 700;
+  background-color: #0071b8;
+  background-image: -webkit-linear-gradient(top,#007bc6,#0071b8);
+  background-image: linear-gradient(to bottom,#007bc6,#0071b8);
+  color: #fff;
+  text-shadow: 0 1px hsla(0,0%,0%,0.5);
+  -webkit-font-smoothing: antialiased;
+}
+.cke_reset_all a.cke_dialog_ui_button_ok:hover,
+.cke_reset_all a.cke_dialog_ui_button_ok:focus {
+  background-color: #2369a6;
+  background-image: -webkit-linear-gradient(top,#0c97ed,#1f86c7);
+  background-image: linear-gradient(to bottom,#0c97ed,#1f86c7);
+  border-color: #1e5c90;
+  color: #fff;
+  box-shadow: 0 1px 2px hsla(203,10%,10%,0.25);
+}
+.cke_reset_all a.cke_dialog_ui_button_ok:focus {
+  border: 1px solid #1280DF;
+  box-shadow: 0 0 0.5em 0.1em hsla(203,100%,60%,0.7);
+}
+.cke_reset_all a.cke_dialog_ui_button_ok:active {
+  background-image: -webkit-linear-gradient(top,#08639b,#0071b8);
+  background-image: linear-gradient(to bottom,#08639b,#0071b8);
+  border-color: #144b78;
+  box-shadow: inset 0 1px 3px hsla(0,0%,0%,0.2);
+}
+.cke_reset_all .cke_dialog_footer_buttons a.cke_dialog_ui_button_ok span {
+  text-shadow: 0 1px hsla(0,0%,0%,0.5);
+}
\ No newline at end of file
diff --git a/core/themes/seven/seven.info.yml b/core/themes/seven/seven.info.yml
index cc9ddd7..fd01d19 100644
--- a/core/themes/seven/seven.info.yml
+++ b/core/themes/seven/seven.info.yml
@@ -24,6 +24,8 @@ libraries-override:
   classy/dialog:
     seven/seven.drupal.dialog
 libraries-extend:
+  core/ckeditor:
+    - seven/ckeditor-dialog
   core/drupal.vertical-tabs:
     - seven/vertical-tabs
   core/jquery.ui:
diff --git a/core/themes/seven/seven.libraries.yml b/core/themes/seven/seven.libraries.yml
index a5b6d8a..e68b75a 100644
--- a/core/themes/seven/seven.libraries.yml
+++ b/core/themes/seven/seven.libraries.yml
@@ -93,6 +93,12 @@ seven.drupal.dialog:
     theme:
       css/components/dialog.css: {}
 
+ckeditor-dialog:
+  version: VERSION
+  css:
+    theme:
+      css/theme/ckeditor-dialog.css: {}
+
 tour-styling:
   version: VERSION
   css: