Question: I have a .txt textfile with a list formatted like 
`[' ok ', ' test ', ' help ']`
How can I read/import this textfile list into a python list?

Answer: 
Simply add a `matTooltipClass="red-tooltip"` in your input tag may be. 
And then in styles.css add the definition for this class

```
<input type="number" matTooltipClass='red-tooltip'/>

.red-tooltip{
       background-color:red;
}

```
color: yellow; does not overwrite the class (mat-tooltip) you have to add !important;

like this:

**XX.component.ts:**

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

@Component({
  selector: 'app-tooltip-demo',
  templateUrl: './XX.component.html',
  styleUrls: ['./XX.component.css'],
  encapsulation: ViewEncapsulation.None
})
export class TooltipDemoComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }
}

```

**HTML Template:**

```
<div matTooltip="This is the Tooltip!" matTooltipPosition="below">This text has a tooltip!</div>

```

**CSS Template:**

```
.mat-tooltip {
  color: yellow !important;
}

```

then it will work !