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HTML 

              
                <div class='container'>
	<div class='ct-inner'>
	
	<!-- Project HTML Below -->
    <div class='calculator'>
     <div class='inner'>
      
      <div class='innerIn'>
       <div class='screen active'>
         <div class='output'>0</div>
		 <div class='output line2'>-</div>
         <div class='output line3'>-</div>
         <div class='screen-layer'></div>
       </div>
	   
	   
	   
	   <div class='controls'>
         
		 
        <div class='num-pad'>
         <div class='button numbers small'>1</div>
         <div class='button numbers small'>2</div>
         <div class='button numbers small'>3</div>
         <div class='button numbers small'>4</div>
         <div class='button numbers small'>5</div>
         <div class='button numbers small'>6</div>
         <div class='button numbers small'>7</div>
         <div class='button numbers small'>8</div>
         <div class='button numbers small'>9</div>
         <div class='button numbers big zeroBtn btnLeftAligned'>0</div>
         <div class='button numbers small'>.</div>
        </div>
		
		<div class='control-pad operator-pad1'>
           <div class='button med oper'>+</div>
           <div class='button med oper'>-</div>
           <div class='button med oper'>÷</div>
           <div class='button med oper'>=</div>
        </div>
         
       </div>
	   
	   
	   
      </div> <!-- Inner in End -->
        
     </div>
    </div>

	
	
	
	<!-- Project HTML Above -->
	
    <div class='by-dev'>
      <span class='by-text'>by</span>
      <span class='by-val'>Deepak Kamat</span>
      <span class='by-site'><a href='http://www.stramaxon.com'>stramaxon.com</a></span>
    </div>


	</div>
	</div>
!

CSS 

              
                /* Page Layout CSS */

htm, body {
background-color:#000;
background: rgb(114,114,114); /* Old browsers */
background: -moz-radial-gradient(center, ellipse cover, rgba(114,114,114,1) 0%, rgba(30,30,30,1) 100%); /* FF3.6+ */
background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,rgba(114,114,114,1)), color-stop(100%,rgba(30,30,30,1))); /* Chrome,Safari4+ */
background: -webkit-radial-gradient(center, ellipse cover, rgba(114,114,114,1) 0%,rgba(30,30,30,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-radial-gradient(center, ellipse cover, rgba(114,114,114,1) 0%,rgba(30,30,30,1) 100%); /* Opera 12+ */
background: -ms-radial-gradient(center, ellipse cover, rgba(114,114,114,1) 0%,rgba(30,30,30,1) 100%); /* IE10+ */
background: radial-gradient(ellipse at center, rgba(114,114,114,1) 0%,rgba(30,30,30,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#727272', endColorstr='#1e1e1e',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
}

html {
    height: auto;
}
    

body {
    font:16px normal normal "Open Sans", sans-serif;
    margin:0px;
    color:#fff;
}


.container {padding:20px;margin:0 auto;}

.calculator {margin:0 auto;} /* Centering */
.calculator {box-shadow:inset 0px 0px 40px rgba(0,0,0,0.1), 30px 30px 60px rgba(0,0,0,0.5) !important;}



/* Calculator CSS */

.calculator {
  width:400px;
  min-height:500px;
  font-family:"Lucida Sans Unicode", "Lucida Grande", sans-serif;
  border:1px solid #ccc;
  border-radius:5px;
  box-shadow:inset 0px 0px 40px rgba(0,0,0,0.1);
 background: rgb(183,183,183); /* Old browsers */
background: -moz-linear-gradient(left, rgba(183,183,183,1) 1%, rgba(201,201,201,1) 52%, rgba(160,160,160,1) 100%, rgba(196,196,196,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right top, color-stop(1%,rgba(183,183,183,1)), color-stop(52%,rgba(201,201,201,1)), color-stop(100%,rgba(160,160,160,1)), color-stop(100%,rgba(196,196,196,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(left, rgba(183,183,183,1) 1%,rgba(201,201,201,1) 52%,rgba(160,160,160,1) 100%,rgba(196,196,196,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(left, rgba(183,183,183,1) 1%,rgba(201,201,201,1) 52%,rgba(160,160,160,1) 100%,rgba(196,196,196,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(left, rgba(183,183,183,1) 1%,rgba(201,201,201,1) 52%,rgba(160,160,160,1) 100%,rgba(196,196,196,1) 100%); /* IE10+ */
background: linear-gradient(to right, rgba(183,183,183,1) 1%,rgba(201,201,201,1) 52%,rgba(160,160,160,1) 100%,rgba(196,196,196,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#b7b7b7', endColorstr='#c4c4c4',GradientType=1 ); /* IE6-9 */
}


.calculator .inner {
  padding:10px;
}

.calculator .screen {
  padding:5px 10px;
  font-size:24px;
  border-radius:5px /* 5px 0px 0px */;
  color:#fff;
  border:1px solid #195739;
  position:relative;
  background-color:#2A8358;
  margin-bottom:10px;
  text-align:right;
  box-shadow:inset 0px 2px 2px rgba(0,0,0,0.7), 0px 2px 1px #eee;
}

.screen .output {
position:relative;
  text-shadow:0px 0px 2px #DFFF5F;
}
.screen .screen-layer {
  position:absolute;
  border-radius:5px;
  top:0px;right:0px;left:0px;bottom:0px;
background: -moz-linear-gradient(top, rgba(174,188,191,0.29) 0%, rgba(117,124,122,0.19) 50%, rgba(10,14,10,0.19) 51%, rgba(10,8,9,0.08) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(174,188,191,0.29)), color-stop(50%,rgba(117,124,122,0.19)), color-stop(51%,rgba(10,14,10,0.19)), color-stop(100%,rgba(10,8,9,0.08))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(174,188,191,0.29) 0%,rgba(117,124,122,0.19) 50%,rgba(10,14,10,0.19) 51%,rgba(10,8,9,0.08) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(174,188,191,0.29) 0%,rgba(117,124,122,0.19) 50%,rgba(10,14,10,0.19) 51%,rgba(10,8,9,0.08) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(174,188,191,0.29) 0%,rgba(117,124,122,0.19) 50%,rgba(10,14,10,0.19) 51%,rgba(10,8,9,0.08) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(174,188,191,0.29) 0%,rgba(117,124,122,0.19) 50%,rgba(10,14,10,0.19) 51%,rgba(10,8,9,0.08) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#4aaebcbf', endColorstr='#140a0809',GradientType=0 ); /* IE6-9 */
  
}


/* Button */
.calculator .button {
  font-size:18px;
  margin:4px 2px;
  text-align:center;
  width:80px;
  background-color:#ccc;
  color:#111;
  border:1px solid ;
  box-sizing:border-box;
background: rgb(242,242,242); /* Old browsers */
background: -moz-linear-gradient(top, rgba(242,242,242,1) 0%, rgba(219,219,219,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(242,242,242,1)), color-stop(100%,rgba(219,219,219,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(242,242,242,1) 0%,rgba(219,219,219,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(242,242,242,1) 0%,rgba(219,219,219,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(242,242,242,1) 0%,rgba(219,219,219,1) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(242,242,242,1) 0%,rgba(219,219,219,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f2f2f2', endColorstr='#dbdbdb',GradientType=0 ); /* IE6-9 */
  border:0px solid #eee;
  box-shadow:0px 0px 3px #000, 0px 2px 1px #fff,inset 0px 3px 1px #fff, inset 0px 0px 2px #999;
  border-radius:5px;
  cursor:pointer;
  font-weight:800;
  text-shadow:1px 0px 0px #fff;
}

.calculator .button:active {
  box-shadow:0px 0px 3px #000, 0px 2px 1px #fff,inset 0px 1px 2px #999, inset 0px 0px 2px #eee;
}


.calculator .button.btnLeftAligned {
  text-align:left;
  padding-left:35px;
} 


/* Numbad */
.num-pad {
  display:inline-block;
  max-width:262px;
  vertical-align:top;
}
.num-pad .button {
  display:inline-block;
  padding:5px 0px;
}

.num-pad .zeroBtn {
  width:169px;
}


/* Operator Pad Num 1 */
.operator-pad1 {
  display:inline-block;
  vertical-align:top;
  width:108px;
}
.operator-pad1 .button:first-child{margin-top:4px;}
.operator-pad1 .button {
width:109px;
padding:5px 0px; 
margin:8px 2px;
}





.by-dev {text-align:center;margin:20px 0;}
.by-dev span {font-family:"Segoe UI",Arial,sans-serif;}
.by-dev .by-text {font-size:30px;display:block;opacity:0.5;}
.by-dev .by-val {font-size:80px;display:block;opacity:0.2;
  text-shadow:0 0 30px rgba(255,255,255,0.7),1px 1px 0px #000;
}
.by-site  a {color:#fff;text-decoration:none;color:rgba(255,255,255,0.4);
border-bottom:1px solid #999;
}
!

JS
!
999px

Console