body{
 	font-family: 'Orbitron', sans-serif;
	 padding: 0%;
	 margin: 0%;

}
.container{
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	height: 100%;
	width: 100%;
	background-image: url(background.jpg);
	 background-repeat: no-repeat;
	 overflow-x: hidden;
	 padding: 0px;
	 margin: 0px;
}
 #calculator{
 	width: 320px;
	height: 540px;
	background-color: black;
	margin: 0 auto;
	top: 70px;
	position: relative;
	border-radius: 40px;
	box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
	animation: calc 1.5s both;
 }
 @keyframes calc{
	 from{
		transform: translateY(60px);
		transform: scale(0.9);
	 }
	 to{
		 transform: translateY(0px);
		 transform: scale(1);
	 }
 }
#result{
	height: 120px;
}
#display{
	width: 280px;
	height: 105px;
	background-image: url(display.jpg);
	margin: 0 auto;
	top: 20px;
	position: relative;
	border-radius: 30px;
	text-align: right;
	padding-bottom: 4px
}
#history{
	text-align: right;
	height: 20px;
	margin: 0 20px;
	padding-top: 20px;
	font-size: 15px;
	color: black;
}
#output{
	text-align: right;
	height: 60px;
	margin: 10px 20px;
	font-size: 30px;
}
#keyboard{
	height: 500px;
}
.operator, .number, .empty{
	width: 50px;
	height: 50px;
	margin: 15px;
	float: left;
	border-radius: 50%;
	border-width: 0;
	font-weight: bold;
	font-size: 15px;
}
.number{
	background-color: #eaedef;
}
.empty{
	background-color: black;
}
.number, .operator{
	cursor: pointer;
}
.operator:active, .number:active{
	font-size: 13px;
}
.operator:focus, .number:focus, .empty:focus{
	outline: 0;
}
.number:hover , .operator:hover{
	background-image: url(hover.jpg);
	/*background-color: grey;*/
	
}
button:nth-child(4){
	font-size: 30px;
	background-image: url(yellow.jpg);
}
button:nth-child(8){
	font-size: 30px;
	background-image: url(reddish.jpg);
}
button:nth-child(12){
	font-size: 30px;
	background-image: url(pink.jpg);
}
button:nth-child(16){
	font-size: 30px;
	background-image: url(blue.jpg);
}
button:nth-child(20){
	font-size: 30px;
	background-color: #9477af;
}

@media screen and (min-width: 480px) {
	html {
	  height: 100%;
	}
	.container{
		overflow-x: hidden;
		background-position: center;
		background-size: cover;
	}
	
  }