.jcalculator_wrap { position: relative; }

.jcalculator {
  background: #232323;
  width: 200px;
  display: none;
  position: absolute;
  top: 82px;
  right: 0;
  font-family: Helvetica, Arial, Verdana, sans-serif;
  border-top: 1px solid #000;
  border-left: 1px solid #000;
}

.jcalculator span {
  cursor: pointer;
  color: #fff;
  float: left;
  display: block;
  width: 50px;
  height: 50px;
  line-height: 50px;
  font-size: 12px;
  box-sizing: border-box;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  border-right: 1px solid #000;
  border-bottom: 1px solid #000;
}

.jcalculator span:active { line-height: 52px; }

.jcalculator .operation { background: #191919; }

.jcalculator .operation.equal { background: #eb0934; }