diff --git a/core/themes/seven/css/components/system-status-report.css b/core/themes/seven/css/components/system-status-report.css
index 55c5e7b..e817feb 100644
--- a/core/themes/seven/css/components/system-status-report.css
+++ b/core/themes/seven/css/components/system-status-report.css
@@ -21,6 +21,8 @@
   position: relative;
   padding: 1em 1em 1em 3em; /* LTR */
   box-sizing: border-box;
+  width: 100%;
+  font-weight: bold;
 }
 .system-status-report__status-title .details-title {
   color: inherit;
diff --git a/core/themes/seven/css/components/system.admin.css b/core/themes/seven/css/components/system.admin.css
deleted file mode 100644
index 1c8ee53..0000000
--- a/core/themes/seven/css/components/system.admin.css
+++ /dev/null
@@ -1,321 +0,0 @@
-/**
- * @file
- * Styles for administration pages.
- */
-
-/**
- * Reusable layout styles.
- */
-.layout-container {
-  margin: 0 1.5em;
-}
-.layout-container:after {
-  content: "";
-  display: table;
-  clear: both;
-}
-
-@media screen and (min-width: 38em) {
-  .layout-container {
-    margin: 0 2.5em;
-  }
-  .layout-column {
-    float: left; /* LTR */
-    box-sizing: border-box;
-  }
-  [dir="rtl"] .layout-column {
-    float: right;
-  }
-  .layout-column + .layout-column {
-    padding-left: 10px; /* LTR */
-  }
-  [dir="rtl"] .layout-column + .layout-column {
-    padding-right: 10px;
-    padding-left: 0;
-  }
-  .layout-column--half {
-    width: 50%;
-  }
-  .layout-column--quarter {
-    width: 25%;
-  }
-  .layout-column--three-quarter {
-    width: 75%;
-  }
-}
-
-/**
- * Panel.
- * Used to visually group items together.
- */
-.panel {
-  padding: 5px 5px 15px;
-}
-.panel__description {
-  margin: 0 0 3px;
-  padding: 2px 0 3px 0;
-}
-
-/**
- * System compact link: to toggle the display of description text.
- */
-.compact-link {
-  margin: 0 0 0.5em 0;
-}
-
-/**
- * Quick inline admin links.
- */
-small .admin-link:before {
-  content: ' [';
-}
-small .admin-link:after {
-  content: ']';
-}
-
-/**
- * Modules page.
- */
-.system-modules thead > tr {
-  border: 0;
-}
-.system-modules div.incompatible {
-  font-weight: bold;
-}
-.system-modules td.checkbox {
-  min-width: 25px;
-  width: 4%;
-}
-.system-modules td.module {
-  width: 25%;
-}
-.system-modules td {
-  vertical-align: top;
-}
-.system-modules label,
-.system-modules-uninstall label {
-  color: #1d1d1d;
-  font-size: 1.15em;
-}
-.system-modules details {
-  color: #5c5c5b;
-  line-height: 20px;
-  overflow: hidden; /* truncates descriptions if too long */
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-.system-modules details[open] {
-  height: auto;
-  overflow: visible;
-  white-space: normal;
-}
-.system-modules details[open] summary .text {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
-  hyphens: auto;
-  text-transform: none;
-}
-.system-modules td details a {
-  color: #5c5c5b;
-  border: 0;
-}
-.system-modules td details {
-  border: 0;
-  margin: 0;
-  height: 20px;
-}
-.system-modules td details summary {
-  padding: 0;
-  text-transform: none;
-  font-weight: normal;
-  cursor: default;
-}
-.system-modules td {
-  padding-left: 0; /* LTR */
-}
-[dir="rtl"] .system-modules td {
-  padding-left: 12px;
-  padding-right: 0;
-}
-
-@media screen and (max-width: 40em) {
-  .system-modules td.name {
-    width: 20%;
-  }
-  .system-modules td.description {
-    width: 40%;
-  }
-}
-.system-modules .requirements {
-  padding: 5px 0;
-  max-width: 490px;
-}
-.system-modules .links {
-  overflow: hidden; /* prevents collapse */
-}
-.system-modules .checkbox {
-  margin: 0 5px;
-}
-.system-modules .checkbox .form-item {
-  margin-bottom: 0;
-}
-.admin-requirements,
-.admin-required {
-  font-size: 0.9em;
-  color: #666;
-}
-.admin-enabled {
-  color: #080;
-}
-.admin-missing {
-  color: #f00;
-}
-.module-link {
-  display: block;
-  padding: 2px 20px;
-  white-space: nowrap;
-  margin-top: 2px;
-  float: left; /* LTR */
-}
-[dir="rtl"] .module-link {
-  float: right;
-}
-.module-link-help {
-  background: url(../../images/core/icons/787878/questionmark-disc.svg) 0 50% no-repeat; /* LTR */
-}
-[dir="rtl"] .module-link-help {
-  background-position: top 50% right 0;
-}
-.module-link-permissions {
-  background: url(../../images/core/icons/787878/key.svg) 0 50% no-repeat; /* LTR */
-}
-[dir="rtl"] .module-link-permissions {
-  background-position: top 50% right 0;
-}
-.module-link-configure {
-  background: url(../../images/core/icons/787878/cog.svg) 0 50% no-repeat; /* LTR */
-}
-[dir="rtl"] .module-link-configure {
-  background-position: top 50% right 0;
-}
-
-/**
- * Appearance page.
- */
-.theme-info__header {
-  margin-bottom: 0;
-  font-weight: normal;
-}
-.theme-default .theme-info__header {
-  font-weight: bold;
-}
-.theme-info__description {
-  margin-top: 0;
-}
-.system-themes-list {
-  margin-bottom: 20px;
-}
-.system-themes-list-uninstalled {
-  border-top: 1px solid #cdcdcd;
-  padding-top: 20px;
-}
-.system-themes-list__header {
-  margin: 0;
-}
-
-.theme-selector {
-  padding-top: 20px;
-}
-.theme-selector .screenshot,
-.theme-selector .no-screenshot {
-  border: 1px solid #e0e0d8;
-  padding: 2px;
-  vertical-align: bottom;
-  max-width: 100%;
-  height: auto;
-  text-align: center;
-}
-.theme-default .screenshot {
-  border: 1px solid #aaa;
-}
-.system-themes-list-uninstalled .screenshot,
-.system-themes-list-uninstalled .no-screenshot {
-  max-width: 194px;
-  height: auto;
-}
-
-@media screen and (min-width: 45em) {
-  .system-themes-list-installed .screenshot,
-  .system-themes-list-installed .no-screenshot {
-    float: left; /* LTR */
-    margin: 0 20px 0 0; /* LTR */
-    width: 294px;
-  }
-  [dir="rtl"] .system-themes-list-installed .screenshot,
-  [dir="rtl"] .system-themes-list-installed .no-screenshot {
-    float: right;
-    margin: 0 0 0 20px;
-  }
-  .system-themes-list-installed .system-themes-list__header {
-    margin-top: 0;
-  }
-  .system-themes-list-uninstalled .theme-selector {
-    box-sizing: border-box;
-    width: 31.25%;
-    float: left; /* LTR */
-    padding: 20px 20px 20px 0; /* LTR */
-  }
-  [dir="rtl"] .system-themes-list-uninstalled .theme-selector {
-    float: right;
-    padding: 20px 0 20px 20px;
-  }
-  .system-themes-list-uninstalled .theme-info {
-    min-height: 170px;
-  }
-}
-
-.system-themes-list-installed .theme-info {
-  max-width: 940px;
-}
-
-.theme-selector .incompatible {
-  margin-top: 10px;
-  font-weight: bold;
-}
-.theme-selector .operations {
-  margin: 10px 0 0 0;
-  padding: 0;
-}
-.theme-selector .operations li {
-  float: left; /* LTR */
-  margin: 0;
-  padding: 0 0.7em;
-  list-style-type: none;
-  border-right: 1px solid #cdcdcd;  /* LTR */
-}
-[dir="rtl"] .theme-selector .operations li {
-  float: right;
-  border-left: 1px solid #cdcdcd;
-  border-right: none;
-}
-.theme-selector .operations li:last-child {
-  padding: 0 0 0 0.7em; /* LTR */
-  border-right: none; /* LTR */
-}
-[dir="rtl"] .theme-selector .operations li:last-child {
-  padding: 0 0.7em 0 0;
-  border-left: none;
-}
-.theme-selector .operations li:first-child {
-  padding: 0 0.7em 0 0; /* LTR */
-}
-[dir="rtl"] .theme-selector .operations li:first-child {
-  padding: 0 0 0 0.7em;
-}
-.system-themes-admin-form {
-  clear: left; /* LTR */
-}
-[dir="rtl"] .system-themes-admin-form {
-  clear: right;
-}
diff --git a/core/themes/seven/seven.info.yml b/core/themes/seven/seven.info.yml
index 4d8824a..369515e 100644
--- a/core/themes/seven/seven.info.yml
+++ b/core/themes/seven/seven.info.yml
@@ -22,10 +22,6 @@ core: 8.x
 libraries:
  - seven/global-styling
 libraries-override:
-  system/admin:
-    css:
-      theme:
-        /core/themes/stable/css/system/system.admin.css: css/components/system.admin.css
   core/drupal.vertical-tabs:
     css:
       component: