2.7 css | animation

<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>

<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">

<style>

/*Defining text stylings*/

#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family: 'Montserrat Alternates', sans-serif;
  font-weight:300;
}

#link {
	font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
	margin:5px 0px 100px 22px;
  color:white;
}

a:link, a:visited, a:active {
	text-decoration: none;
  color:white;
  border-bottom:1.5px dotted white;
}

body {
  background-color:#011227;
}

/*Defining chart stylings*/

#lights {
  width:500px;
}

.bulb {
  width: 100px;
  height: 10px;
  float: left;
  margin: 10px 10px;
  transform: rotate(-45deg);
}

.bulb:nth-child(odd) {
  background:#8ff798;
  animation: blub1 2s;
}

.bulb:nth-child(even) {
  background:#85f6fa;
}

@keyframes blub1 {
  from {} to {opacity:0;}
}

</style>
</head>

<body>

<p id="h1">CSS | ANIMATION</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>

<div id ="lights" style="text-align:center;"></div>
<div class="bulb"></div>
<div class="bulb"></div>

//Defining the loop
for ( var i = 0 ; i < 45 ; i++ ) {
      var bulb = document.createElement("div");
      	  bulb.className = "bulb";
      	  document.getElementById("lights")
                  .appendChild(bulb);}

</script>
</body>
</html>