I'm starting to develop an web app in Angular using the Angular Material library for the interface. But I'm getting an error when trying to import a prebuilt theme. In order to import it, I added <link rel="stylesheet" href="../node_modules/@angular/material/prebuilt-themes/indigo-pink.css"> to my index.html file but when i run ng serve I cannot get the file.
If you are using angular-cli follow their steps for including Angular-Material.
Ensure you have the below imports in src/styles.css
@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';
@import '~https://fonts.googleapis.com/icon?family=Material+Icons';
It's slightly different to what angular-material suggest on their own Getting Started site but it worked for me.
Check that your path is correct. I had the same problem and I fixed the path: Mine is
<link rel="stylesheet" href="lib/@angular/material/core/theming/prebuilt/indigo-pink.css">
来源：https://stackoverflow.com/questions/43813878/angular-2-material-cant-load-style