Sass bootstrap unable to set height of textarea - css

Question

I have an admin page like this:
<div class="admin_page">
<div ng-repeat="user in users">
<div class="my-form-group">
<textarea class="my-form-control">{{user}}</textarea>
</div>
</div>
</div>
This is my main.scss file:
.my-form-group {
#extend .form-group;
.my-form-control {
#extend .form-control
}
}
#import "./admin.scss";
This is my admin.scss:
.admin_page {
textarea {
height: 200px;
}
}
The height of text area is not set.
I tried <textarea class="my-form-control" style="height:200px">{{user}}</textarea> and it works.
Why is the sass version not working?
Edit:
this is my heading:
<!--underscore-->
<script src="/node_modules/underscore/underscore-min.js"></script>
<!--jquery-->
<script src="/node_modules/jquery/dist/jquery.min.js"></script>
<!--bootstrap (keep the css although duplicate in bundle, since some may depend on it)-->
<script src="/node_modules/bootstrap/dist/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="/node_modules/bootstrap/dist/css/bootstrap.min.css">
<!--font-awesome-->
<link rel="stylesheet" href="/node_modules/font-awesome/css/font-awesome.min.css">
<!--summernote-->
<link rel="stylesheet" href="/node_modules/summernote/dist/summernote.css">
<!--<link rel="stylesheet" href="/node_modules/summernote/dist/summernote-bs3.css">-->
<script src="/node_modules/summernote/dist/summernote.min.js"></script>
<!--angular-->
<script src="/node_modules/angular/angular.min.js"></script>
<script src="/node_modules/angular-resource/angular-resource.min.js"></script>
<script src="/node_modules/angular-route/angular-route.min.js"></script>
<script src="/node_modules/angular-sanitize/angular-sanitize.min.js"></script>
<!--angular-summernote-->
<script src="/node_modules/angular-summernote/dist/angular-summernote.min.js"></script>
<!--bundle-->
<script src="/public/script/bundle.js"></script>
<link rel="stylesheet" type="text/css" href="/public/style/bundle.css">
Note that I imported sass version of bootstrap in main.scss, which means inside bundle I have the bootstrap css.
The reason I include the original non-sass version bootstrap is for summernote, which depends on bootstrap.
Edit 2:
I tried the following:
.admin_page {
.my-textarea {
#extend .my-form-control;
height: 500px;
}
}
which has a specificity of 0,0,2,0 (2 classes), it doesnot work
Also this:
.admin_page {
textarea.my-form-control {
height: 200px
}
}
which has a specificity of 0,0,2,1 (2 classes + 1 element), it works. Why is the previous one not working?

Answer 1

It is not problem of sass. It is clearly the problem of specificity.
You just need to mention high specificity css. Since you have a class to the textarea, you can do like this:
textarea.my-form-control{
height: 200px;
}
Read this to understand how specificity works in css.