Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

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-left: 0;
+  padding-right: 1.5em;
+}
+
+/* Account settings */
+.user-admin-settings .details-description {
+  font-size: 0.85em;
+  padding-bottom: .5em;
+}

core/modules/user/css/user.icons.theme.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 {
+  height: 100%;
+  width: 0;
+  background-color: gray;
+}
+.password-confirm-match {
+  visibility: hidden;
+}

core/modules/user/css/user.theme.css

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+/**
+ * @file
+ * Theme styling for user module.
+ */
+
+/* Visual styling for the Password strength indicator */
+.password-strength__meter {
+  margin-top: 0.5em;
+  background-color: #ebeae4;
+}
+.password-strength__indicator {
+  background-color: #77b259;
+  -webkit-transition: width 0.5s ease-out;
+  transition: width 0.5s ease-out;
+}
+.password-strength__indicator.is-weak {
+  background-color: #e62600;
+}
+.password-strength__indicator.is-fair {
+  background-color: #e09600;
+}
+.password-strength__indicator.is-good {
+  background-color: #0074bd;
+}
+.password-strength__indicator.is-strong {
+  background-color: #77b259;
+}
+
+.password-confirm,
+.password-field,
+.password-strength,
+.password-confirm-match {
+  width: 55%;
+}
+
+.password-suggestions {
+  padding: 0.2em 0.5em;
+  margin: 0.7em 0;
+  max-width: 34.7em;
+  border: 1px solid #b4b4b4;
+}
+.password-suggestions ul {
+  margin-bottom: 0;
+}
+
+.confirm-parent,
+.password-parent {
+  clear: left; /* LTR */
+  margin: 0;
+  max-width: 33em;
+  overflow: hidden;
+}
+[dir="rtl"] .confirm-parent,
+[dir="rtl"] .password-parent {
+  clear: right;
+}