How do I break free from constraints placed by other CSS code

Hello,

on this page https://goo.gl/JYeu2z there's a google map in embeded in an iframe.

<iframe style="border: 0;" src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d52703.72503342482!2d58.663129170303066!3d34.35091546442272!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x3f121fdc66f0de93%3A0x97ae5d04f8abd8f!2sGonabad%2C+Razavi+Khorasan+Province%2C+Iran!5e0!3m2!1sen!2sus!4v1493787455772" width="2000" height="300" frameborder="0" allowfullscreen="allowfullscreen"></iframe>

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