Add below link after ng add / npm i command
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<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
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<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
add this to html file
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Add CSS stylesheet for Material Icons!
Add the following to your index.html:
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">