dos

Public/static/css/index.css

@@ -81,6 +81,11 @@ input::-webkit-input-placeholder {
   -webkit-animation: hand 2s linear infinite;
 }
 
+.btn-slideleft {
+  animation: slideLeft 1.5s linear infinite;
+  -webkit-animation: slideLeft 1.5s linear infinite;
+}
+
 input[name=customize] {
   font-size: 22px;
   color: #333;
@@ -103,4 +108,26 @@ input[name=customize] {
   50% {
     -webkit-transform: translateX(5px);
   }
+}
+
+@keyframes slideLeft {
+  0%,100% {
+    transform: translateX(5px);
+    opacity: 1;
+  }
+  50% {
+    transform: translateX(-5px);
+    opacity: 0;
+  }
+}
+
+@-webkit-keyframes slideLeft {
+  0%,100% {
+    -webkit-transform: translateX(5px);
+    opacity: 1;
+  }
+  50% {
+    -webkit-transform: translateX(-5px);
+    opacity: 0;
+  }
 }
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