diff --git a/src/SQLInsight.Hub/Portal/Pages/Overview.razor b/src/SQLInsight.Hub/Portal/Pages/Overview.razor
index 7dd6c13..2e9b1be 100644
--- a/src/SQLInsight.Hub/Portal/Pages/Overview.razor
+++ b/src/SQLInsight.Hub/Portal/Pages/Overview.razor
@@ -28,11 +28,11 @@
                     <td>@(c.Plan ?? "–")</td>
                     <td class="nowrap @(c.LicenseExpires < Queries.Now.AddDays(30) ? "bad" : "")">@(c.LicenseExpires?.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture) ?? "–")</td>
                     <td class="num">@c.Instances</td>
-                    <td class="counts">
+                    <td><div class="counts">
                         @if (c.Critical > 0) { <Sev Severity="4" Count="c.Critical" /> }
                         @if (c.High > 0) { <Sev Severity="3" Count="c.High" /> }
                         @if (c.Critical == 0 && c.High == 0) { <span class="muted">ingen kritiske/høje</span> }
-                    </td>
+                    </div></td>
                     <td class="nowrap @(c.LastSubmission < Queries.Now.AddHours(-1) ? "bad" : "")">@(c.LastSubmission?.ToString("yyyy-MM-dd HH:mm", CultureInfo.InvariantCulture) ?? "aldrig") UTC</td>
                 </tr>
             }
diff --git a/src/SQLInsight.Web/Components/Pages/Home.razor b/src/SQLInsight.Web/Components/Pages/Home.razor
index 3a1d18a..5839f4a 100644
--- a/src/SQLInsight.Web/Components/Pages/Home.razor
+++ b/src/SQLInsight.Web/Components/Pages/Home.razor
@@ -45,12 +45,12 @@ else
                     </td>
                     <td><a href="/instanser/@Uri.EscapeDataString(i.Name)"><strong>@i.Name</strong></a><div class="muted">@i.ServerName</div></td>
                     <td>@(i.ProductVersion is null ? "–" : Display.Release(i.ProductVersion, i.EngineEdition))<div class="muted">@i.ProductVersion @i.ProductLevel @i.ProductUpdateLevel</div></td>
-                    <td class="counts">
+                    <td><div class="counts">
                         @if (i.Critical > 0) { <SeverityBadge Severity="Severity.Critical" Count="i.Critical" /> }
                         @if (i.High > 0) { <SeverityBadge Severity="Severity.High" Count="i.High" /> }
                         @if (i.Medium > 0) { <SeverityBadge Severity="Severity.Medium" Count="i.Medium" /> }
                         @if (i.Low > 0) { <SeverityBadge Severity="Severity.Low" Count="i.Low" /> }
-                    </td>
+                    </div></td>
                     <td>@i.NotMeasurable</td>
                     <td title="@Display.Time(i.LastSeenAt)">@Display.Ago(i.LastSeenAt)</td>
                 </tr>
diff --git a/tests/SQLInsight.Community.Tests/TableMarkupTests.cs b/tests/SQLInsight.Community.Tests/TableMarkupTests.cs
new file mode 100644
index 0000000..e9713b5
--- /dev/null
+++ b/tests/SQLInsight.Community.Tests/TableMarkupTests.cs
@@ -0,0 +1,57 @@
+using System.Text.RegularExpressions;
+
+namespace SQLInsight.Community.Tests;
+
+/// <summary>
+/// A table cell must stay a table cell. A class that sets display: flex or grid turns a &lt;td&gt;/&lt;th&gt; into a flex box,
+/// so it gets its own height and border and the row's divider jumps (the severity badges on the overviews did that).
+/// Such classes belong on an element inside the cell. Checked for every site's stylesheet against its own pages.
+/// </summary>
+public sealed partial class TableMarkupTests
+{
+    [Theory]
+    [InlineData("SQLInsight.Web")]
+    [InlineData("SQLInsight.Hub")]
+    [InlineData("SQLInsight.Community")]
+    public void No_table_cell_has_a_flex_or_grid_class(string project)
+    {
+        var folder = Path.Combine(RepositoryRoot(), "src", project);
+        var layoutClasses = Directory.EnumerateFiles(Path.Combine(folder, "wwwroot"), "*.css", SearchOption.AllDirectories)
+            .SelectMany(css => FlexOrGridRule().Matches(File.ReadAllText(css)))
+            .SelectMany(rule => ClassName().Matches(rule.Groups["selectors"].Value).Select(c => c.Groups[1].Value))
+            .ToHashSet(StringComparer.Ordinal);
+
+        var offenders = Directory.EnumerateFiles(folder, "*.razor", SearchOption.AllDirectories)
+            .Where(file => !file.Contains($"{Path.DirectorySeparatorChar}bin{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
+                           && !file.Contains($"{Path.DirectorySeparatorChar}obj{Path.DirectorySeparatorChar}", StringComparison.Ordinal))
+            .SelectMany(file => CellClass().Matches(File.ReadAllText(file))
+                .SelectMany(cell => cell.Groups["classes"].Value.Split(' ', StringSplitOptions.RemoveEmptyEntries))
+                .Where(layoutClasses.Contains)
+                .Select(c => $"{Path.GetFileName(file)}: <td/th class=\"{c}\">"))
+            .ToList();
+
+        Assert.True(offenders.Count == 0, "Flyt klassen ind på et element i cellen: " + string.Join(", ", offenders));
+    }
+
+    private static string RepositoryRoot()
+    {
+        var root = AppContext.BaseDirectory;
+        while (!File.Exists(Path.Combine(root, "SQLInsight.slnx")))
+        {
+            root = Path.GetDirectoryName(root) ?? throw new InvalidOperationException("SQLInsight.slnx ikke fundet.");
+        }
+
+        return root;
+    }
+
+    // A rule whose declarations set display to (inline-)flex or (inline-)grid; media queries are fine, their inner rules match.
+    [GeneratedRegex(@"(?<selectors>[^{}]+)\{[^{}]*\bdisplay\s*:\s*(inline-)?(flex|grid)\b")]
+    private static partial Regex FlexOrGridRule();
+
+    [GeneratedRegex(@"\.([A-Za-z][\w-]*)")]
+    private static partial Regex ClassName();
+
+    // Literal class names only; Razor expressions (@…) in the attribute are skipped by splitting on spaces.
+    [GeneratedRegex(@"<t[dh]\b[^>]*\bclass=""(?<classes>[^""]*)""")]
+    private static partial Regex CellClass();
+}