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wp-includes/css/dist/admin-ui/style.css

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+.admin-ui-page{
+  background-color:#fff;
+  color:#2f2f2f;
+  container:admin-ui-page/inline-size;
+  display:flex;
+  flex-flow:column;
+  height:100%;
+  position:relative;
+  z-index:1;
+}
+@media not (prefers-reduced-motion){
+  .admin-ui-page{
+    transition:width .2s ease-out;
+  }
+}
+
+.admin-ui-page__header{
+  background:#fff;
+  border-bottom:1px solid #f0f0f0;
+  padding:16px 48px;
+  position:sticky;
+  top:0;
+}
+@container (max-width: 430px){
+  .admin-ui-page__header{
+    padding:16px 24px;
+  }
+}
+
+.admin-ui-page__header-subtitle{
+  color:#757575;
+  font-family:-apple-system,"system-ui",Segoe UI,Roboto,Oxygen-Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif;
+  font-size:13px;
+  font-weight:400;
+  line-height:20px;
+  margin:0;
+  padding-block-end:8px;
+}
+
+.admin-ui-page__content{
+  display:flex;
+  flex-direction:column;
+  flex-grow:1;
+  overflow:auto;
+}
+.admin-ui-page__content.has-padding{
+  padding:16px 20px;
+}
+@container (max-width: 430px){
+  .admin-ui-page__content.has-padding{
+    padding:16px 24px;
+  }
+}
+
+.show-icon-labels .admin-ui-page__header-actions .components-button.has-icon{
+  padding:0 8px;
+  width:auto;
+}
+.show-icon-labels .admin-ui-page__header-actions .components-button.has-icon svg{
+  display:none;
+}
+.show-icon-labels .admin-ui-page__header-actions .components-button.has-icon:after{
+  content:attr(aria-label);
+  font-size:12px;
+}