taking default placeholder of input field mat-form-field code example

Example 1: angular material input

Html
<form class="example-form">
  <mat-form-field class="example-full-width">
    <mat-label>Favorite food</mat-label>
    <input matInput placeholder="Ex. Pizza" value="Sushi">
  </mat-form-field>

  <mat-form-field class="example-full-width">
    <mat-label>Leave a comment</mat-label>
    <textarea matInput placeholder="Ex. It makes me feel..."></textarea>
  </mat-form-field>
</form>

TS
import {Component} from '@angular/core';

/**
 * @title Basic Inputs
 */
@Component({
  selector: 'input-overview-example',
  styleUrls: ['input-overview-example.css'],
  templateUrl: 'input-overview-example.html',
})
export class InputOverviewExample {}

CSS
.example-form {
  min-width: 150px;
  max-width: 500px;
  width: 100%;
}

.example-full-width {
  width: 100%;
}

Example 2: stylin mat input

//Standard
  .mat-form-field {
    .mat-input-element {
      color: slategray;
    }
    .mat-form-field-label {
      color: slategray;
    }
    .mat-form-field-underline {
      background-color: slategray;
    }
    .mat-form-field-ripple {
      background-color: slategray;
    }
    .mat-form-field-required-marker {
      color: slategray;
    }
  }

  //Focus
  .mat-form-field.mat-focused {
    .mat-form-field-label {
      color: #ff884d;
    }
    .mat-form-field-ripple {
      background-color: #ff884d;
    }
    .mat-form-field-required-marker {
      color: #ff884d;
    }
    .mat-input-element {
      color: #ff884d;
    }
  }

  //Error
  .mat-form-field.mat-form-field-invalid {
    .mat-input-element {
      color: #ff33cc;
    }
    .mat-form-field-label {
      color: #ff33cc;
      .mat-form-field-required-marker {
        color: #ff33cc;
      }
    }
    .mat-form-field-ripple {
      background-color: #ff33cc;
    }
  }