Angular 5.2.1 - slider doesn't show

Hello, I was looking for a good looking slider for my project and I found this one but the slider doesn’t show and I’m not sure wheither it’s my fault or not.

app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { NouisliderModule } from 'ng2-nouislider';
import { AppComponent } from './app.component';


@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        NouisliderModule
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

app.component.css:

@import "~nouislider/distribute/nouislider.min.css";
...

app.component.html:

<nouislider [connect]="true" [min]="0" [max]="15" [(ngModel)]="inputSpeedRange"></nouislider>

app.component.ts:

public inputSpeedRange = [4, 80];

[kiqq]

Do you have FormsModule imported in app.module.ts?

[kiqq]

Move @import "~nouislider/distribute/nouislider.min.css"; to styles.css.