Iframe Height Not Responsive Codeigniter

i have a problem about Iframe in my Website, Im Use adminlte2 and codeigniter. I want to put my iframe into the body from view. If the parent menu in side bar is not open or expand, height from my iframe is Ok. But when i open child from parent menu in sidebar, the height from my iframe is not follow height from my sidebar, this is the css i write :

<style>
.fullheight-container {
  max-width: 100%;
  max-height: 100%;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.full-width {
  min-width: 100%;
  min-height: 100%;
  overflow: hidden;
}
</style>

This is my iframe :

<div id="bagianiframe" class="fullheight-container">
    <iframe src="<? echo $link ?>" #window1 class="full-width" allowfullscreen="true" frameborder="0">
    </iframe>
  </div>

To be clear, I inserted 2 pictures to show the condition. When sidebar is not expanded

When sidebar is expanded

Thank you.