Membuat Calculator Dengan Javascript dan CSS


/* Basic reset */
* {
 margin: 0;
 padding: 0;
 box-sizing: border-box;
 
 /* Better text styling */
 font: bold 14px Arial, sans-serif;
}

/* Finally adding some IE9 fallbacks for gradients to finish things up */

/* A nice BG gradient */
html {
 height: 100%;
 background: white;
 background: radial-gradient(circle, #fff 20%, #ccc);
 background-size: cover;
}

/* Using box shadows to create 3D effects */
#calculator {
 width: 325px;
 height: auto;
 
 margin: 100px auto;
 padding: 20px 20px 9px;
 
 background: #9dd2ea;
 background: linear-gradient(#9dd2ea, #8bceec);
 border-radius: 3px;
 box-shadow: 0px 4px #009de4, 0px 10px 15px rgba(0, 0, 0, 0.2);
}

/* Top portion */
.top span.clear {
 float: left;
}

/* Inset shadow on the screen to create indent */
.top .screen {
 height: 40px;
 width: 212px;
 
 float: right;
 
 padding: 0 10px;
 
 background: rgba(0, 0, 0, 0.2);
 border-radius: 3px;
 box-shadow: inset 0px 4px rgba(0, 0, 0, 0.2);
 
 /* Typography */
 font-size: 17px;
 line-height: 40px;
 color: white;
 text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
 text-align: right;
 letter-spacing: 1px;
}

/* Clear floats */
.keys, .top {overflow: hidden;}

/* Applying same to the keys */
.keys span, .top span.clear {
 float: left;
 position: relative;
 top: 0;
 
 cursor: pointer;
 
 width: 66px;
 height: 36px;
 
 background: white;
 border-radius: 3px;
 box-shadow: 0px 4px rgba(0, 0, 0, 0.2);
 
 margin: 0 7px 11px 0;
 
 color: #888;
 line-height: 36px;
 text-align: center;
 
 /* prevent selection of text inside keys */
 user-select: none;
 
 /* Smoothing out hover and active states using css3 transitions */
 transition: all 0.2s ease;
}

/* Remove right margins from operator keys */
/* style different type of keys (operators/evaluate/clear) differently */
.keys span.operator {
 background: #FFF0F5;
 margin-right: 0;
}

.keys span.eval {
 background: #f1ff92;
 box-shadow: 0px 4px #9da853;
 color: #888e5f;
}

.top span.clear {
 background: #ff9fa8;
 box-shadow: 0px 4px #ff7c87;
 color: white;
}

/* Some hover effects */
.keys span:hover {
 background: #9c89f6;
 box-shadow: 0px 4px #6b54d3;
 color: white;
}

.keys span.eval:hover {
 background: #abb850;
 box-shadow: 0px 4px #717a33;
 color: #ffffff;
}

.top span.clear:hover {
 background: #f68991;
 box-shadow: 0px 4px #d3545d;
 color: white;
}

/* Simulating "pressed" effect on active state of the keys by removing the box-shadow and moving the keys down a bit */
.keys span:active {
 box-shadow: 0px 0px #6b54d3;
 top: 4px;
}

.keys span.eval:active {
 box-shadow: 0px 0px #717a33;
 top: 4px;
}

.top span.clear:active {
 top: 4px;
 box-shadow: 0px 0px #d3545d;
}