I have mitigated the problem, while there is a more appropriate solution. Using the reference links above, I don't know if this works on all components, but on some I have seen it work well.
<!--For redzen 5.1-->
<link rel="stylesheet" href="_content/Radzen.Blazor/css/material-base.css">
<link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />