Error importing angular material 6 custom theme in styles.css

Question

I created a custom theme using Angular Material 6. When I import the theme in styles.css I get the error:

./src/styles.css (./node_modules/raw-loader!./node_modules/postcss-loader/lib??embedded!./src/styles.css) Module build failed: Error: Can't resolve '@angular/material/theming' in 'C:\Users\D3L1ghT\Documents\PROJECTS\social-network\techhub\src'

Here is my code for my-theme.scss:

@import "~@angular/material/theming";

@include mat-core();

$my-theme-primary: mat-palette($mat-custom-blue, 400);
$my-theme-accent: mat-palette($mat-custom-blue, A100, A100, A400);

$my-theme: mat-light-theme($my-theme-primary, $my-theme-accent);

$primary-color: map_get($my-theme-primary, 400);
$secondary-color: map_get($my-theme-accent, 500);

@include angular-material-theme($my-theme);

Here is the code for styles.css:

/* @import "~@angular/material/prebuilt-themes/indigo-pink.css"; */
@import url("./my-theme.scss");

This is a screenshot of angular.json: angular.json

Timo Bähr Timo Bähr · Accepted Answer · 2018-07-14T11:11:53

You should not add your theme.scss file inside the css file.

Follow these steps:

(Optional) Delete default theme in file src/styles.css:

@import '~@angular/material/prebuilt-themes/the-default-theme.css';

Create a file theme.scss inside src folder.
Open file angular.json (or angular-cli.json) inside your root folder

Add your theme "src/theme.scss" into the styles array:

"projects": {
  "your-app": {
    ...
    "architect": {
      "build": {
        ...
        "options": {
          ...
          "styles": [
            "src/styles.css",
            "src/theme.scss"
          ],
        },
      },
    },
  },
}

Restart the app.

Further links:

Theming Guideline from material.angular.io

Error importing angular material 6 custom theme in styles.css

2 Answers