How to display different blocks for mobile and desktops

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I want to display a fixed banner from the bottom left of the screen. But at the same time, the banner is different for desktops and mobile devices. Please tell me. How can I determine the user's device? For this, can I use the wp_is_mobile function? As I understand it, wp_is_mobile identifies the device by the user agent of the browser. PHP code is very simple. Something like the following? <?php…

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