Add bootstrap and basic layout

Hcs.WebApp/wwwroot/app.css

@@ -1,3 +1,25 @@
+html, body {
+    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+}
+
+a, .btn-link {
+    color: #006bb7;
+}
+
+.btn-primary {
+    color: #fff;
+    background-color: #1b6ec2;
+    border-color: #1861ac;
+}
+
+.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
+    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
+}
+
+.content {
+    padding-top: 1.1rem;
+}
+
 h1:focus {
     outline: none;
 }
@@ -21,7 +43,7 @@ h1:focus {
 }
 
     .blazor-error-boundary::after {
-        content: "An error has occurred."
+        content: "An error has occurred"
     }
 
 .darker-border-checkbox.form-check-input {