Angular material Could not find Angular Material core theme

Please insert below code into your styles.css which is located in your src folder.

@import "../node_modules/@angular/material/prebuilt-themes/deeppurple-amber.css";

You can select any css under the prebuilt-themes folder.

put that code into your angular-cli.json file

"styles": [
    "../node_modules/@angular/material/prebuilt-themes/deeppurple-amber.css"
  ],

it's works fine for me

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