Merge pull request #8997 from NuGet/main

[ReleasePrep][2022.02.09] FI of main into dev

Author: drewgillies

src/AccountDeleter/EmptyFeatureFlagService.cs

@@ -86,6 +86,11 @@ public bool IsDisplayVulnerabilitiesEnabled()
             throw new NotImplementedException();
         }
 
+        public bool IsDotnet20BannerEnabled()
+        {
+            throw new NotImplementedException();
+        }
+
         public bool IsForceFlatContainerIconsEnabled()
         {
             throw new NotImplementedException();

src/Bootstrap/dist/css/bootstrap-theme.css

@@ -9,6 +9,72 @@
     }
   }
 
+  div.dotnet-20-banner {
+    position: relative;
+    margin-top: 32px;
+  }
+
+  .dotnet-20-banner {
+    .dotnet-20-image {
+      position: absolute;
+      top: 0;
+      left: 0;
+      height: 100%;
+      width: 100%;
+
+      img {
+        height: 100%;
+        width: 100%;
+        object-fit: cover;
+        background-color: #000;
+      }
+    }
+
+    .container {
+      .row {
+        color: white;
+
+        @media (max-width: @screen-md-max) {
+          margin-top: 48px;
+          margin-bottom: 48px;
+        }
+
+        @media (min-width: @screen-md-max) {
+          margin-top: 144px;
+          margin-bottom: 144px;
+        }
+
+        .banner-text {
+          backdrop-filter: blur(2px);
+
+          h2 {
+            margin-top: 0px;
+            font-weight: 600;
+          }
+
+          h3 {
+            margin-top: 0px;
+            font-weight: 400;
+          }
+
+          a {
+            padding: 5px 12px 5px 12px;
+            border: 1px solid white;
+            color: white;
+            font-weight: 600;
+          }
+
+          a:focus {
+            outline-color: #fff;
+            outline-style: dashed;
+            outline-width: 2px;
+            outline-offset: 3px;
+          }
+        }
+      }
+    }
+  }
+
   .what-is-nuget {
     font-size: 1.15em;
     padding-bottom: 75px;