Replace UFO with hatching egg. Refs 4891

wagtail/project_template/home/static/css/welcome_page.css

@@ -85,6 +85,38 @@ svg:not(:root) {
     max-width: 265px;
 }
 
+@-webkit-keyframes pos {
+    0%, 100% {
+        -webkit-transform: rotate(-6deg);
+        transform: rotate(-6deg);
+    }
+    50% {
+        -webkit-transform: rotate(6deg);
+        transform: rotate(6deg);
+    }
+}
+
+@keyframes pos {
+    0%, 100% {
+        -webkit-transform: rotate(-6deg);
+        transform: rotate(-6deg);
+    }
+    50% {
+        -webkit-transform: rotate(6deg);
+        transform: rotate(6deg);
+    }
+}
+
+.egg {
+    fill: #43b1b0;
+    -webkit-animation: pos 3s ease infinite;
+            animation: pos 3s ease infinite;
+    -webkit-transform: translateY(50px);
+            transform: translateY(50px);
+    -webkit-transform-origin: 50% 80%;
+            transform-origin: 50% 80%;
+}
+
 .main-text {
     max-width: 400px;
     margin: 5px auto;