style.css

#shape{
	width:200px;
	height:200px;
	background-color:#FFBABA;
	display:none;
	position:relative;
}

.glow{
	display: inline-block;
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.6);  
}


body{
	background-color: black;
	background-image:  url('data:image/svg+xml,%3Csvg width="42" height="44" viewBox="0 0 42 44" xmlns="http://www.w3.org/2000/svg"%3E%3Cg id="Page-1" fill="none" fill-rule="evenodd"%3E%3Cg id="brick-wall" fill="%239C92AC" fill-opacity="0.4"%3E%3Cpath d="M0 0h42v44H0V0zm1 1h40v20H1V1zM0 23h20v20H0V23zm22 0h20v20H22V23z"/%3E%3C/g%3E%3C/g%3E%3C/svg%3E');;
}

.jumbotron{
	text-align: center;
}

.container{
	background-color: transparent;
}

#game-screen.show {
	transition-delay: 5s;
}

.show {
	max-height: 1000px;
	transition-duration: 1s;
	display: block;
}

.hide {
	max-height: 0;
	overflow: hidden;
	transition-duration: 1s;
}

#game-task {
  text-align: center;
  overflow: hidden;  
}

#start{
	margin: 0 45%;
	margin-top: 15%;
	font-size: 30px;
	display: inline-block;
	-webkit-tap-highlight-color: transparent;
	transform: translateZ(0);
	box-shadow: 0 0 1px transparent;
}

form{
	width: 30%;
	margin: 25px auto;
}

@keyframes pulse-shrink {
	100% {
	  transform: scale(0.9);
	}
}
#start:hover {
	animation-name: pulse-shrink;
	animation-duration: 0.3s;
	animation-timing-function: linear;
	animation-iteration-count: infinite;
	animation-direction: alternate;
	color:#28a745;
	background-color: white;
}