/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
 * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the top of the
 * compiled file, but it's generally better to create a new file per style scope.
 *
 *= require_self
 *= require_tree .
 */

@import "bootstrap";

body {
  min-height: 2000px;
  padding-top: 70px;
}

#create-topic-control {
  height: 400px;
  width: 100%;
  position: fixed;
  bottom: 0;
  left: 0;
  background-color: #f0f0f0;
  zoom: 1;
  filter: alpha(opacity=90);
  opacity: 0.9;

  div.modal-header {
    padding: 20px 70px;
  }

  div.topic-content {
    padding: 30px 70px 10px 70px;
  }

  .has-feedback {
    .form-control-feedback {
      top: 0px;
      right: 15px;
    }
  }

}

/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
 * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the top of the
 * compiled file, but it's generally better to create a new file per style scope.
 *
 *= require_self
 *= require_tree .
 */

@import "bootstrap";

body {
  min-height: 1000px;
  padding-top: 70px;
}

#create-topic-control {
  height: 400px;
  width: 100%;
  position: fixed;
  bottom: 0;
  left: 0;
  background-color: #f0f0f0;
  zoom: 1;
  filter: alpha(opacity=90);
  opacity: 0.9;

  div.modal-header {
    padding: 20px 70px;
  }

  div.topic-content {
    padding: 30px 70px 10px 70px;
  }

  .has-feedback {
    .form-control-feedback {
      top: 0px;
      right: 15px;
    }
  }

}

Change body min-height to 1000px
Change body min-height to 1000px
