dos

Public/static/css/index.css

@@ -185,6 +185,11 @@ canvas {
   -webkit-animation: cloud2 5s linear infinite;
 }
 
+.first-block,
+.second-block {
+  z-index: 30;
+}
+
 @-webkit-keyframes luo {
   0% {
     top: -1%;