bootstrap 4 de resimler sabit boyutta olsa aslında row içinde olduğu için yükseklik vermeye de gerek kalmaz

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<a title="1080p Gece Görüşlü Kamera" href="https://market.miuiturkiye.net/ev-ofis-guvenlik-kameralari/xiaomi-yi-home-2-1080P-gece-goruslu-smart-%C4%B1p-kamera">
<img src="https://market.miuiturkiye.net/image/catalog/banner/banner-a.jpg" style="height: 500px;" class="img-responsive" alt="1080p Gece Görüşlü Kamera">
</a>
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<a title="Xiaomi Scooter" href="https://market.miuiturkiye.net/xiaomi-mijia-m365-pro-electric-scooter-elektrikli-scooter">
<img src="https://market.miuiturkiye.net/image/catalog/banner/banner-b.jpg" style="height: 250px;" class="img-responsive" alt="Xiaomi Scooter">
</a>
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<a title="Xiaomi Verge Lite" href="https://market.miuiturkiye.net/xiaomi-amazfit-verge-lite">
<img src="https://market.miuiturkiye.net/image/catalog/banner/banner-c.jpg" style="height: 250px;" class="img-responsive" alt="Xiaomi Verge Lite">
</a>
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<div class="col-4"><a title="Xiaomi TWS Airdots Earphones Lite " href="https://market.miuiturkiye.net/xiaomi-tws-airdots-earphones-lite-bluetooth-kulaklik-beyaz">
<img src="https://market.miuiturkiye.net/image/catalog/banner/banner-d.jpg" style="height: 500px;" class="img-responsive" alt="Xiaomi TWS Airdots Earphones Lite ">
</a>
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