.container
  .iframe-wrapper
    <iframe src="https://yandex.ru/map-widget/v1/?um=constructor%3A6f1dd9533584b57fd6206c8c6007fa110ee1510d7c50b54cd2f69f6eb9bd6611&amp;source=constructor" width="100%" frameborder="0"></iframe>
View Compiled 
.container {
  margin-top: 30px;
  max-width: 1170px;
  margin-left: auto;
  margin-right: auto;
}

.iframe-wrapper {
  background: #e6e6e6;
  min-height: 200px;
  > iframe {
    height: 100% !important;
  }
  
}
View Compiled

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.