first commit

core/modules/user/css/user.admin.css

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+/**
+ * @file
+ * Admin styling for the User module.
+ */
+
+/* Permissions page */
+.permissions .module {
+  font-weight: bold;
+}
+.permissions .permission {
+  padding-left: 1.5em; /* LTR */
+}
+[dir="rtl"] .permissions .permission {
+  padding-right: 1.5em;
+  padding-left: 0;
+}
+
+/* Account settings */
+.user-admin-settings .details-description {
+  padding-bottom: 0.5em;
+  font-size: 0.85em;
+}

core/modules/user/css/user.icons.admin.css

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+/*
+ * DO NOT EDIT THIS FILE.
+ * See the following change record for more information,
+ * https://www.drupal.org/node/3084859
+ * @preserve
+ */
+
+/**
+ * @file
+ * Styling for the user module icons.
+ */
+
+/**
+ * Toolbar tab icon.
+ */
+
+.toolbar-bar .toolbar-icon-user::before {
+  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16'%3e%3cpath fill='%23bebebe' d='M1 15c-.275 0-.498-.225-.496-.5 0 0 .007-.746 1.071-1.512 1.138-.818 2.347-.969 3.308-1.498s.954-1.299.925-2.115c-.019-.543-.112-.657-.489-1.392-.556-1.084-.709-2.021-.791-2.823-.127-1.252.011-3.035.86-4.001.847-.964 2.114-1.104 2.114-1.104l.5-.055.498.055s1.266.14 2.113 1.104c.85.966.988 2.75.859 4.001-.08.802-.234 1.739-.791 2.823-.377.734-.476.849-.488 1.392-.029.816-.035 1.586.926 2.115s2.17.68 3.307 1.498c1.064.766 1.072 1.512 1.072 1.512.002.275-.221.5-.496.5h-14.002z'/%3e%3c/svg%3e");
+}
+
+.toolbar-bar .toolbar-icon-user:active::before,
+.toolbar-bar .toolbar-icon-user.is-active::before {
+  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16'%3e%3cpath fill='%23ffffff' d='M1 15c-.275 0-.498-.225-.496-.5 0 0 .007-.746 1.071-1.512 1.138-.818 2.347-.969 3.308-1.498s.954-1.299.925-2.115c-.019-.543-.112-.657-.489-1.392-.556-1.084-.709-2.021-.791-2.823-.127-1.252.011-3.035.86-4.001.847-.964 2.114-1.104 2.114-1.104l.5-.055.498.055s1.266.14 2.113 1.104c.85.966.988 2.75.859 4.001-.08.802-.234 1.739-.791 2.823-.377.734-.476.849-.488 1.392-.029.816-.035 1.586.926 2.115s2.17.68 3.307 1.498c1.064.766 1.072 1.512 1.072 1.512.002.275-.221.5-.496.5h-14.002z'/%3e%3c/svg%3e");
+}

core/modules/user/css/user.icons.admin.pcss.css

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+/**
+ * @file
+ * Styling for the user module icons.
+ */
+
+/**
+ * Toolbar tab icon.
+ */
+.toolbar-bar .toolbar-icon-user::before {
+  background-image: url(../../../misc/icons/bebebe/person.svg);
+}
+.toolbar-bar .toolbar-icon-user:active::before,
+.toolbar-bar .toolbar-icon-user.is-active::before {
+  background-image: url(../../../misc/icons/ffffff/person.svg);
+}

core/modules/user/css/user.module.css

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+/**
+ * @file
+ * Module styling for user module.
+ */
+.password-strength__title,
+.password-strength__text {
+  display: inline;
+}
+.password-strength__meter {
+  height: 0.75em;
+  margin-top: 0.5em;
+  background-color: lightgray;
+}
+.password-strength__indicator {
+  width: 0;
+  height: 100%;
+  background-color: gray;
+}
+.password-confirm-match {
+  visibility: hidden;
+}