Use wp-admin classnames and inherit core CSS.

class-two-factor-core.php

@@ -1723,7 +1723,7 @@ public static function user_two_factor_options( $user ) {
 		?>
 		<h3><?php esc_html_e( 'Two-Factor Options', 'two-factor' ); ?></h3>
 		<input type="hidden" name="<?php echo esc_attr( self::ENABLED_PROVIDERS_USER_META_KEY ); ?>[]" value="<?php /* Dummy input so $_POST value is passed when no providers are enabled. */ ?>" />
-		<table class="two-factor-methods-table">
+		<table class="wp-list-table widefat fixed striped table-view-list two-factor-methods-table">
 			<thead>
 				<tr>
 					<th class="col-enabled" scope="col"><?php esc_html_e( 'Enabled', 'two-factor' ); ?></th>

user-edit.css

@@ -1,20 +1,3 @@
-
-.two-factor-methods-table {
-	background-color: #fff;
-	border: 1px solid #e5e5e5;
-	border-spacing: 0;
-	width: 100%;
-}
-
-.two-factor-methods-table thead,
-.two-factor-methods-table tfoot {
-	background: #fff;
-}
-
-.two-factor-methods-table thead th {
-	padding: 0.5em;
-}
-
 .two-factor-methods-table .col-primary,
 .two-factor-methods-table .col-enabled {
 	width: 5%;
@@ -33,10 +16,6 @@
 	vertical-align: top;
 }
 
-.two-factor-methods-table tbody tr:nth-child(odd) {
-	background-color: #f9f9f9;
-}
-
 .two-factor-methods-table .two-factor-method-label {
 	display: block;
 	font-weight: 700;