style: 更新样式

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/Tutorials/MFA/Login.razor

@@ -9,7 +9,7 @@
     <div class="bb-sign-body">
         <div class="mb-2">Username or email address</div>
         <input type="text" class="form-control mb-3" value="argo@blazor.zone" />
-        <div class="d-flex mb-2">
+        <div class="d-flex justify-content-between mb-2">
             <div>Password</div>
             <div>Forgot password?</div>
         </div>