Step 1 - Solution Structure + Frontend

CLI - Put the Project Structure in Place

Git

git init && dotnet new gitignore

Add Solution

dotnet new sln --format sln -n BlazorDemo

Add Blazor Server

dotnet new blazor -int Server -n BlazorDemo.Frontend.InteractiveServer

Add Shared UI Components

dotnet new razorclasslib -n BlazorDemo.Frontend.Shared.Ui

add reference to UI for InteractiveServer

dotnet reference add BlazorDemo.Frontend.Shared.Ui/BlazorDemo.Frontend.Shared.Ui.csproj --project BlazorDemo.Frontend.InteractiveServer/BlazorDemo.Frontend.InteractiveServer.csproj

Update sln

dotnet sln add **/*.csproj

Code - Use the Shared UI

BlazorDemo.Frontend.Shared.Ui/CustomLayout.razor

@inherits LayoutComponentBase

<div class="page">
    <main>
        <div class="top-row">
            <h3 class="top-row">
                Custom Layout
            </h3>
            <a class="px-2"
               href="/">
                Home
            </a>
            <a class="px-2"
               href="weather">
                Weather
            </a>
        </div>

        <article class="customcontent px-2">
            <div class="content-center">
                @Body
            </div>
        </article>
    </main>
</div>

<div id="blazor-error-ui"
     data-nosnippet>
    An unhandled error has occurred.
    <a href="."
       class="reload">
        Reload
    </a>
    <span class="dismiss">🗙</span>
</div>

BlazorDemo.Frontend.Shared.Ui/CustomLayout.razor.css

.page {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.customcontent {
    flex: 1;
    display: flex;
    justify-content: center;   /* horizontal center */
    align-items: flex-start;   /* top instead of vertical center */
    padding-top: 2rem;         /* optional */
}

.content-center {
    text-align: center;
}

.top-row {
    background-color: #f7f7f7;
    border-bottom: 1px solid #d6d5d5;
    justify-content: flex-start;
    height: 3.5rem;
    display: flex;
    align-items: center;
}

    .top-row :deep a, .top-row ::deep .btn-link {
        white-space: nowrap;
        margin-left: 1.5rem;
        text-decoration: none;
    }

    .top-row ::deep a:hover, .top-row ::deep .btn-link:hover {
        text-decoration: underline;
    }

    .top-row ::deep a:first-child {
        overflow: hidden;
        text-overflow: ellipsis;
    }

@media (max-width: 640.98px) {
    .top-row {
        justify-content: space-between;
    }

    .top-row ::deep a, .top-row ::deep .btn-link {
        margin-left: 0;
    }
}

@media (min-width: 641px) {
    .page {
        flex-direction: row;
    }

    .sidebar {
        width: 250px;
        height: 100vh;
        position: sticky;
        top: 0;
    }

    .top-row {
        position: sticky;
        top: 0;
        z-index: 1;
    }

    .top-row.auth ::deep a:first-child {
        flex: 1;
        text-align: right;
        width: 0;
    }

    .top-row, article {
        padding-left: 2rem !important;
        padding-right: 1.5rem !important;
    }
}

blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

BlazorDemo.Frontend.InteractiveServer/Components/Routes.razor

...
        <RouteView RouteData="routeData" DefaultLayout="typeof(CustomLayout)" />
...

BlazorDemo.Frontend.InteractiveServer/Components/_Imports.razor

...

@using BlazorDemo.Frontend.Shared.Ui

Bonus: Formatting

.editorconfig

[*]

# charset = utf-8-bom
indent_size = 4
indent_style = space
insert_final_newline = false
max_line_length = 100
tab_width = 4
end_of_line = lf

[*.razor]
resharper_html_attribute_style = first_attribute_on_single_line
resharper_html_attribute_indent = align
resharper_html_space_before_self_closing = true

[*.cs]
# attributes
resharper_place_attribute_on_same_line = never

# fluent call formatting
resharper_csharp_wrap_after_dot = true
resharper_csharp_wrap_chained_method_calls = chop_always
resharper_csharp_wrap_before_first_method_call = true

install resharper cli

dotnet tool install -g JetBrains.ReSharper.GlobalTools

use resharper cli

jb cleanupcode BlazorDemo.sln --profile="Built-in: Reformat Code"