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;
}

```
Here's a solution without ::ng-deep / ViewEncapsulation.None. With it you can also use different tooltips in same / different components and each will have their own separate style.

> 
> Firstly, in styles.scss define
> 
> 
> 
> ```
> .mat-tooltip.my-tooltip
> {
> background-color: blue !important;
> }
> 
> ```
> 
> Then in the html component with matTooltip use:
> 
> 
> 
> ```
> [matTooltipClass]="'my-tooltip'"
> 
> ```
> 
> I hope this helps
> 
> 
>