Add public layout footer card

styles/37-layouts-page-layout-public.css

@@ -2,6 +2,18 @@
 /* Layouts: Page Layout Public                               */
 /* ========================================================= */
 
+body {
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+}
+
+main {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+}
+
 .sg-page-layout-public__heading-block {
   margin-top: var(--spacing-large);
   margin-bottom: var(--spacing-large);
@@ -11,4 +23,11 @@
   width: 70vw;
   max-width: 1100px;
   margin-inline: auto;
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+}
+
+.sg-page-layout-public__footer-group {
+  margin-top: auto;
 }