You can try this combination in your code:

1. CSS overflow-y: hidden;
2. scrolling="no" (for HTML4)
3. and seamless="seamless" (for HTML5)

<!-- begin snippet: js hide: false -->

<!-- language: lang-css -->

.foo-class {
  width: 200px;
  height: 200px;
  overflow-y: hidden;
}

<!-- language: lang-html -->

<iframe src="https://google.com" 
        class="foo-class" 
        scrolling="no" 
        seamless="seamless">
</iframe>

<!-- end snippet -->