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button.component.css

button {
    padding: 16px;
    background: #2196f3;
    color : #fff;
    font-size:1.2em;
}

button.component.html

<button>
  {{label}}
</button>

button.component.ts

import { Component, OnInit, Input } from '@angular/core';

@Component({
  selector: 'lib-button',
  templateUrl: './button.component.html',
  styleUrls: ['./button.component.css']
})
export class ButtonComponent implements OnInit {

  @Input() label: string;

  constructor() { }

  ngOnInit() {
  }

}