composer require sashsvamir/yii2-jquery.scrolltop:"dev-master"
Scroll to top button (jquery).
in view (usually main template):
use sashsvamir\scrollTop;
scrollTop\ScrollTop::widget([
'offset' => 1300, // Scroll length offset (from top) when button appear
'nativeStyle' => true, // Whether using native botton's styles or user css
]);