<div class="@hover">
    Hover to change color.
</div>

@functions {
    private string hover;
    private string color = "white";

    protected override async Task OnInitAsync()
    {
        hover = await Styled.Css($@"
            padding: 32px;
            background-color: hotpink;
            font-size: 24px;
            border-radius: 4px;
            &:hover {{
                color: {color};
            }}
        ");
    }
}