How to ng style color change in C#?

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Hello I want to change the color of the background of textarea with angular. I use the code below. I want to change the color when I select it. And when I choose it falls into this field, the color becomes red. But the color does not change in the interface.How to show interface change color?

What I have tried:

app.controller("myTextArea", function($scope) {
    $scope.myAreas = {
        "color" : "black",
        "background-color" : "red",
        "font-size" : "30px",
        "padding" : "100px"
    }
});

Posted 30-Jul-20 4:12am

Member 14169626

Updated 30-Jul-20 16:59pm

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Sandeep Mewara · Answer 1 · 2020-07-30T16:59:00

You can achieve this using css itself.

For changing the color of textarea control (input), something like below:

CSS

.mat-form-field-empty.mat-form-field-label {
    color: green;
}

For changing the underline-color when it's highlighted-

CSS

.mat-form-field-underline {
    background-color: red;
}

Add this in styles.scss (or styles.css).

Alternatively, you can make use of themes: Angular Material UI component library[^]