:host::ng-deep {
    .test2 {
        color: black !important;
        font-weight: bold;
        background-color: greenyellow !important;
    }
    .test {
        color: red;
        font-weight: bold;
        background-color: yellow;
    }
    .test1 {
        color: blue ;
        font-weight: bold;
        background-color: salmon;
    }
}