caranya mudah.. https://www.quora.com/Ive-designed-a-survey-using-Google-Forms-but-it%E2%80%99s-way-too-wide-for-mobile-use-How-do-I-make-a-Google-form-responsive-on-a-mobile
When you paste the embed code into your blogpost or website, notice the "width" setting in the code. The default width is set to "760". You have to change that value to "100%".
<iframe src="YOURFORMHERE" width="100%" height="800" frameborder="0" marginheight="0" marginwidth="0">Loading...</iframe>
