diff --git a/Lombiq.BaseTheme.Samples/License.md b/Lombiq.BaseTheme.Samples/License.md
deleted file mode 100644
index d57e130..0000000
--- a/Lombiq.BaseTheme.Samples/License.md
+++ /dev/null
@@ -1,13 +0,0 @@
-Copyright © 2021, [Lombiq Technologies Ltd.](https://lombiq.com)
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
-- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
-- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
-
-- Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Lombiq.BaseTheme.Samples/Lombiq.BaseTheme.Samples.csproj b/Lombiq.BaseTheme.Samples/Lombiq.BaseTheme.Samples.csproj
index b4159e1..becb8fd 100644
--- a/Lombiq.BaseTheme.Samples/Lombiq.BaseTheme.Samples.csproj
+++ b/Lombiq.BaseTheme.Samples/Lombiq.BaseTheme.Samples.csproj
@@ -18,7 +18,7 @@
     <PackageTags>OrchardCore;Lombiq;AspNetCore;Sass;Theming</PackageTags>
     <RepositoryUrl>https://github.com/Lombiq/Orchard-Base-Theme</RepositoryUrl>
     <PackageProjectUrl>https://github.com/Lombiq/Orchard-Base-Theme/blob/dev/Lombiq.BaseTheme.Samples/Readme.md</PackageProjectUrl>
-    <PackageLicenseFile>License.md</PackageLicenseFile>
+    <PackageLicenseExpression>BSD-3-Clause</PackageLicenseExpression>
   </PropertyGroup>
 
   <ItemGroup>
@@ -43,7 +43,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Include="License.md" Pack="true" PackagePath="" />
     <None Include="Readme.md" />
     <None Include="NuGetIcon.png" Pack="true" PackagePath="" />
     <None Remove="node_modules\**" />
diff --git a/Lombiq.BaseTheme.Samples/Manifest.cs b/Lombiq.BaseTheme.Samples/Manifest.cs
index 29ccf98..83524b1 100644
--- a/Lombiq.BaseTheme.Samples/Manifest.cs
+++ b/Lombiq.BaseTheme.Samples/Manifest.cs
@@ -11,7 +11,9 @@
     Website = "https://github.com/Lombiq/Orchard-Base-Theme",
     Description = "A sample theme that builds on Lombiq Base Theme.",
     // This is a new property in DerivedTheme. By setting it to a static resource you can define a default icon for this
-    // theme. You can define other "link" resources too, using the Link property.
+    // theme. You can define other "link" resources too, using the LinkJson property. They should be valid Json strings.
+    // For example:
+    // LinksJson = "[{\"Href\": \"~/example/style.css\", \"Rel\": \"stylesheet\"}]"
     Favicon = "~/Lombiq.BaseTheme.Samples/icons/favicon.ico"
 )]
 
diff --git a/Lombiq.BaseTheme.Tests.UI/License.md b/Lombiq.BaseTheme.Tests.UI/License.md
deleted file mode 100644
index d57e130..0000000
--- a/Lombiq.BaseTheme.Tests.UI/License.md
+++ /dev/null
@@ -1,13 +0,0 @@
-Copyright © 2021, [Lombiq Technologies Ltd.](https://lombiq.com)
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
-- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
-- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
-
-- Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Lombiq.BaseTheme.Tests.UI/Lombiq.BaseTheme.Tests.UI.csproj b/Lombiq.BaseTheme.Tests.UI/Lombiq.BaseTheme.Tests.UI.csproj
index 0459c5d..1a15297 100644
--- a/Lombiq.BaseTheme.Tests.UI/Lombiq.BaseTheme.Tests.UI.csproj
+++ b/Lombiq.BaseTheme.Tests.UI/Lombiq.BaseTheme.Tests.UI.csproj
@@ -13,7 +13,7 @@
     <PackageTags>OrchardCore;Lombiq;AspNetCore;Sass;Shouldly;xUnit;UITesting;Testing</PackageTags>
     <RepositoryUrl>https://github.com/Lombiq/Orchard-Base-Theme</RepositoryUrl>
     <PackageProjectUrl>https://github.com/Lombiq/Orchard-Base-Theme/blob/dev/Lombiq.BaseTheme.Tests.UI/Readme.md</PackageProjectUrl>
-    <PackageLicenseFile>License.md</PackageLicenseFile>
+    <PackageLicenseExpression>BSD-3-Clause</PackageLicenseExpression>
   </PropertyGroup>
 
   <ItemGroup>
@@ -29,7 +29,6 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Include="License.md" Pack="true" PackagePath="" />
     <None Include="Readme.md" />
     <None Include="NuGetIcon.png" Pack="true" PackagePath="" />
   </ItemGroup>
diff --git a/Lombiq.BaseTheme/Assets/Styles/abstracts/_mixins.scss b/Lombiq.BaseTheme/Assets/Styles/abstracts/_mixins.scss
index 6d4c46e..ce4e2ae 100644
--- a/Lombiq.BaseTheme/Assets/Styles/abstracts/_mixins.scss
+++ b/Lombiq.BaseTheme/Assets/Styles/abstracts/_mixins.scss
@@ -210,6 +210,13 @@
     }
 }
 
+/// Apply it to <button> or <input type="button"> elements to eliminate the browser default styles.
+@mixin reset-button {
+    all: initial;
+    font: inherit;
+    color: inherit;
+}
+
 @mixin padding-gutter($vertical-multiplier: $default-vertical-multiplier) {
     @include media-breakpoint-only(xs) {
         padding: calc(var(--gutter-x-small) * #{$vertical-multiplier}) var(--gutter-x-small);
@@ -323,3 +330,9 @@
 @mixin gap-gutter($multiplier: 1) {
     @include apply-gutter("gap", $multiplier);
 }
+
+@mixin font-awesome-icon-free($unicode) {
+    font-family: "Font Awesome 6 Free", serif;
+    font-weight: 900;
+    content: $unicode;
+}
diff --git a/Lombiq.BaseTheme/Attributes/DerivedThemeAttribute.cs b/Lombiq.BaseTheme/Attributes/DerivedThemeAttribute.cs
index d5f47a5..14674df 100644
--- a/Lombiq.BaseTheme/Attributes/DerivedThemeAttribute.cs
+++ b/Lombiq.BaseTheme/Attributes/DerivedThemeAttribute.cs
@@ -1,8 +1,9 @@
-using Lombiq.BaseTheme.Constants;
+using Lombiq.BaseTheme.Constants;
 using OrchardCore.DisplayManagement.Manifest;
 using OrchardCore.ResourceManagement;
 using System;
 using System.Collections.Generic;
+using System.Text.Json;
 
 namespace Lombiq.BaseTheme.Attributes;
 
@@ -12,9 +13,13 @@ namespace Lombiq.BaseTheme.Attributes;
 [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = true, Inherited = false)]
 public sealed class DerivedThemeAttribute : ThemeAttribute
 {
-    public IEnumerable<LinkEntry> Links { get; set; }
+    public string LinksJson { get; set; }
     public string Favicon { get; set; }
 
+    public IEnumerable<LinkEntry> Links => LinksJson == null
+        ? []
+        : JsonSerializer.Deserialize<IEnumerable<LinkEntry>>(LinksJson);
+
     public DerivedThemeAttribute() =>
         BaseTheme = FeatureIds.BaseTheme;
 }
diff --git a/Lombiq.BaseTheme/Controllers/AdminController.cs b/Lombiq.BaseTheme/Controllers/AdminController.cs
index 8cfe64f..a856c26 100644
--- a/Lombiq.BaseTheme/Controllers/AdminController.cs
+++ b/Lombiq.BaseTheme/Controllers/AdminController.cs
@@ -84,6 +84,8 @@ public async Task<IActionResult> Index()
     [ValidateAntiForgeryToken]
     public async Task<IActionResult> Update([FromForm] BaseThemeSettingsViewModel viewModel)
     {
+        if (!ModelState.IsValid) return BadRequest(ModelState);
+
         var siteSettings = await _siteService.LoadSiteSettingsAsync();
         siteSettings.Alter<BaseThemeSettings>(nameof(BaseThemeSettings), settings =>
         {
diff --git a/Lombiq.BaseTheme/License.md b/Lombiq.BaseTheme/License.md
deleted file mode 100644
index d57e130..0000000
--- a/Lombiq.BaseTheme/License.md
+++ /dev/null
@@ -1,13 +0,0 @@
-Copyright © 2021, [Lombiq Technologies Ltd.](https://lombiq.com)
-
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
-
-- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
-
-- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
-
-- Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Lombiq.BaseTheme/Lombiq.BaseTheme.csproj b/Lombiq.BaseTheme/Lombiq.BaseTheme.csproj
index 32a07b6..a1287f2 100644
--- a/Lombiq.BaseTheme/Lombiq.BaseTheme.csproj
+++ b/Lombiq.BaseTheme/Lombiq.BaseTheme.csproj
@@ -17,7 +17,7 @@
     <PackageTags>OrchardCore;Lombiq;AspNetCore;Sass;Theming</PackageTags>
     <RepositoryUrl>https://github.com/Lombiq/Orchard-Base-Theme</RepositoryUrl>
     <PackageProjectUrl>https://github.com/Lombiq/Orchard-Base-Theme</PackageProjectUrl>
-    <PackageLicenseFile>License.md</PackageLicenseFile>
+    <PackageLicenseExpression>BSD-3-Clause</PackageLicenseExpression>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(NuGetBuild)' != 'true'">
@@ -32,7 +32,6 @@
   </Target>
 
   <ItemGroup>
-    <None Include="License.md" Pack="true" PackagePath="" />
     <None Include="..\Readme.md" />
     <None Include="NuGetIcon.png" Pack="true" PackagePath="" />
     <None Remove="node_modules\**" />
diff --git a/Lombiq.BaseTheme/Permissions/BaseThemeSettingsPermissions.cs b/Lombiq.BaseTheme/Permissions/BaseThemeSettingsPermissions.cs
index 4512f0a..4d25ee7 100644
--- a/Lombiq.BaseTheme/Permissions/BaseThemeSettingsPermissions.cs
+++ b/Lombiq.BaseTheme/Permissions/BaseThemeSettingsPermissions.cs
@@ -1,4 +1,4 @@
-using Lombiq.HelpfulLibraries.OrchardCore.Users;
+using Lombiq.HelpfulLibraries.OrchardCore.Users;
 using OrchardCore.Security.Permissions;
 using System.Collections.Generic;
 
@@ -9,5 +9,5 @@ public class BaseThemeSettingsPermissions : AdminPermissionBase
     public static readonly Permission ManageBaseThemeSettings =
         new(nameof(ManageBaseThemeSettings), "Manage Lombiq.BaseTheme Settings.");
 
-    protected override IEnumerable<Permission> AdminPermissions => new[] { ManageBaseThemeSettings };
+    protected override IEnumerable<Permission> AdminPermissions => [ManageBaseThemeSettings];
 }
diff --git a/Lombiq.BaseTheme/Services/IconResourceFilter.cs b/Lombiq.BaseTheme/Services/IconResourceFilter.cs
index f2b4f00..861c2b8 100644
--- a/Lombiq.BaseTheme/Services/IconResourceFilter.cs
+++ b/Lombiq.BaseTheme/Services/IconResourceFilter.cs
@@ -8,6 +8,7 @@
 using OrchardCore.Themes.Services;
 using System;
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Lombiq.BaseTheme.Services;
 
@@ -47,7 +48,13 @@ public void AddResourceFilter(ResourceFilterBuilder builder) =>
                         AddIcon(resourceManager, icon);
                     }
 
-                    theme.Links?.ForEach(resourceManager.RegisterLink);
+                    var themeLinks = theme.Links;
+
+                    if (themeLinks?.Any() == true)
+                    {
+                        themeLinks.ForEach(linkEntry => linkEntry.Href = _orchardHelper.ResourceUrl(linkEntry.Href));
+                        themeLinks.ForEach(resourceManager.RegisterLink);
+                    }
                 }
 
                 // If the site setting icon is set, that should take priority.
diff --git a/Lombiq.BaseTheme/ViewModels/BaseThemeSettingsViewModel.cs b/Lombiq.BaseTheme/ViewModels/BaseThemeSettingsViewModel.cs
index 4ca5c6c..19edfd8 100644
--- a/Lombiq.BaseTheme/ViewModels/BaseThemeSettingsViewModel.cs
+++ b/Lombiq.BaseTheme/ViewModels/BaseThemeSettingsViewModel.cs
@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
 using OrchardCore.DisplayManagement;
 
 namespace Lombiq.BaseTheme.ViewModels;
@@ -6,7 +6,8 @@ namespace Lombiq.BaseTheme.ViewModels;
 public class BaseThemeSettingsViewModel
 {
     public string Icon { get; set; }
-    public bool HideMenu { get; set; }
+
+    public required bool HideMenu { get; set; }
 
     [BindNever]
     public IShape Editor { get; set; }