Theme based global.scss is not applied on modal in ionic 3

Ionic Framework ionic-v3
1 
.dark-theme{
     .toolbar-background{
            background-color: $headerBackgroundColor;
            color: $textColor1;
        } 
        .toolbar-title-md{
            color: $textColor1;
            font-family: Poppins;
            font-size: 17px;
            font-style: normal;
            font-weight: 500;
            line-height: 26px;
            letter-spacing: 0em;
            text-align: center;
        }
    }