Update style.css

Invaders/style.css

@@ -4,3 +4,33 @@
   display: block;
   background: white
 }
+h2 {
+  position: relative;
+  text-transform: uppercase;
+  letter-spacing: 6px;
+  font-size: 22px;
+  text-align: center;
+  font-weight: 900;
+  text-decoration: none;
+  color: black;
+  display: inline-block;
+  background-size: 120% 100%;
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+  -moz-background-clip: text;
+  -moz-text-fill-color: transparent;
+  -ms-background-clip: text;
+  -ms-text-fill-color: transparent;
+  background-clip: text;
+  background-color: #000000;
+  animation: 0.2s shake infinite alternate;
+}
+
+@keyframes shake {
+  0% { transform: skewX(-15deg); }
+  5% { transform: skewX(15deg); }
+  10% { transform: skewX(-15deg); }
+  15% { transform: skewX(15deg); }
+  20% { transform: skewX(0deg); }
+  100% { transform: skewX(0deg); }  
+}