How to overide SCSS files ?

[Toomavic]

After successfully integrate ionic-material with project, I found that there is some design issues

First

In ionic official documentation here , describing how to implement item-thumbnail , and the normal shape should be like this

But instead I found that :(

Second

In bar element, the normal view for it should be as shown here

but instead I found

PS

this is how I inserted ionic.material.min.css file, and I tried to put it above ionic.css but same design issues
<link href="lib/ionic/css/ionic.css" rel="stylesheet">
<link href="lib/ionic-material/dist/ionic.material.min.css" rel="stylesheet">

I need a safe approach to overide scss file style , or how to remove it!