style.css

body
{
	 
	font-family:'Oswald',sans-serif;
	background-repeat: no-repeat;
	background-size: cover;
    max-width:100%;
	background-color:#edf0ee;
	background-image:url('https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQB83Pue64Tbd-3o3TROd1VEvpUc376Ok-374zjyFPQ00JqoXAI');
	
}
#wrapper
{ max-width:100%;
background-color:#edf0ee;
 width:1000px;
height:550px;
margin:20px auto;
background-repeat: no-repeat;
	background-size: cover;
	  box-sizing: border-box;
background-image:url('https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcS31yG6mc52B67Agkcqlr8w4GXF-Wqr5YSgKzrNUbYBfIC8XIUA');	  
}
#calculator{
	width: 320px;
	height: 520px;
	margin: 0 auto;
	top: 20px;
	position: relative;
	border-radius: 5px;
	box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
	opacity:0.8;
	  box-sizing: border-box;
	  max-width:100%;
	  
}

#result{
	height: 120px;
	background-color:#a2c4fa;
	  box-sizing: border-box;
	  max-width:100%;
}
#history{
	text-align: right;
	height: 20px;
	margin: 0 20px;
	padding-top: 20px;
	font-size: 15px;
	color: #919191;
	  box-sizing: border-box;
	  max-width:100%;
}
#output{
	text-align: right;
	height: 100px;
	margin: 10px 20px;
	font-size: 30px;
	  box-sizing: border-box;
	  max-width:100%;
}
#output-value
{
	height:40px;
	width:270px;
	border:solid;
	font-size:30px;
	font-family:'Oswald',sans-serif;
	text-align:right;
	  box-sizing: border-box;
	  max-width:100%;
}	
#keyboard{
	height: 400px;
		background-color:#eb6edb;
		  box-sizing: border-box;
		  max-width:100%;
}
.operator, .number, .empty{
	width: 50px;
	height: 50px;
	margin: 15px;
	float: left;
	border-radius: 50%;
	border-width: 0;
	font-weight: bold;
	font-size: 15px;
	  box-sizing: border-box;
}
.number, .empty{
	background-color: #eaedef !important;
	  box-sizing: border-box;
}
.number, .operator{
	cursor: pointer;
	  box-sizing: border-box;
}
.operator:active, .number:active{
	font-size: 13px;
	  box-sizing: border-box;
	
}
.operator:focus, .number:focus, .empty:focus{
	outline: 0;
	  box-sizing: border-box;
}
#%{
	background-color:#eb4034;
	
  }