*
{
	margin:0;
	padding: 0;
	box-sizing: border-box;
	font-family: sans-serif;
}
body{
	display: flex;
	justify-content: center;
	align-items: center;
	min-height: 100vh;
	background-image: radial-gradient(circle 248px at center, #16d9e3 0%, #30c7ec 47%, #46aef7 100%);
}
.calculator{
	position: relative;
	display: grid;
	box-shadow: inset 0 0 50px rgba(0,0,0,.4),
				0 40px 40px rgba(0,0,0,.4),
				0 0 0 4px rgba(255,255,255,4);

}
.calculator .value{
	grid-column: span 4;
	height: 100px;
	text-align: right;
	border:none;
	outline: none;
	padding: 10px;
	font-size: 20px ; 

}
.calculator span{
	display: grid;
	width: 80px;
	height: 80px;
	color: #fff;
	background: #0c2835;
	place-items:center;
	border: 2px solid rgba(0,0,0,.1);
	font-size: 20px;
	cursor: pointer;
}
.calculator span:hover{
	font-size: 40px;
	background: blue;
	transition: 0.2s;
	transition-timing-function: ease-in;
}
.calculator span:active{
	background: #090989;
}


.calculator span.clear{
	grid-column: span 2;
	width: 160px;
	background: #ff6600;
	font-size: 40px;
	
}
.calculator span.clear:hover{
	font-size: 60px;
	transition: 0.2s;
	transition-timing-function: ease-in;
}
.calculator span.clear:active{
	background: #cc5004;
	color: #fff;
}

.calculator span.plus{
	grid-row: span 2;
	height: 160px;
	background: #808080;
	font-size: 50px;
	

}
.calculator span.plus:hover{
	font-size: 60px;
	transition: 0.2s;
	transition-timing-function: ease-in;
}
.calculator span.plus:active{
	background: #4c4a4a;
	color: #fff;
}

.calculator span.equal{
	background: #ff6600;
	font-size: 50px;
	
}
.calculator span.equal:hover{
	font-size: 60px;
	transition: 0.2s;
	transition-timing-function: ease-in;
}
.calculator span.equal:active{
	background: #cc5004;
	color: #fff;
}

.calculator span.tool{
	background: #808080;
	font-size: 40px;
}
.calculator span.tool:hover{
	font-size: 60px;
	transition: 0.2s;
	transition-timing-function: ease-in;
}
.calculator span.tool:active{
	background: #4c4a4a;
	color: #fff;
}