.calculator {
  background: #F0F0F0;
  font-size: 16px;
}

.calculator .displayBox {
  background: #455A64;
  padding: 0 20px;
  min-height: 220px;
  overflow: hidden;
}

.calculator .displayText {
  margin-top: 110px;
  background: transparent;
  border: none;
  color: #FFF;
  font-size: 20px;
  font-weight: 100;
  padding-right: 20px;
  padding-bottom: -10px;
  float: right;
  display: inline-block;
  overflow: hidden;
}

.calculator .operationSide {
  background: #FFF;
  margin-top: 0px;
  padding-left: -20px;
  padding-top: 14px;
  border-left: 1px solid #E5E5E5;
}

.calculator.numberPad {
  padding-top: 14px;
}

.calculator.btn-calc, .btn-calc:focus {
  background: transparent;
  color: #A2A2A2;
  font-size: 25px;
  width: 75px;
  height: 75px;
  font-weight: 100;
  border-radius: 100px;
  outline: none;
  box-shadow: 0px 0px 0px transparent;
  border: none;
}

.calculator.btn-calc:hover {
  background: #FFF;
  color: #455A64;
}

.calculator.btn-operation {
  background: transparent;
  color: #999;
  font-size: 25px;
  /*width: 97px;*/
  width: 100%;
  height: 80.8px;
  font-weight: 100;
  border-radius: 0;
  outline: none;
  box-shadow: 0px 0px 0px transparent;
}

.calculator.btn-operation:focus {
  background: #E8E8E8;
  color: #444;
  outline: 0;
}

.calculator.btn-operation:hover {
  background: #E8E8E8;
  color: #444;
}

.calculator.equals, .equals:focus {
  background: #455A64;
  color: #FFF;
}

.calculator.equals:hover {
  background: #455A64;
  color: #FFF;
}

.calculator.clear, .clear:focus {
  background: #455A64 !important;
  color: #FFF;
  font-size: 25px;
  width: 75px;
  height: 75px;
  font-weight: 100;
  outline: none;
  box-shadow: 0px 0px 0px transparent;
  border: transparent;
}

.calculator.clear:hover {
  background: #455A64;
  color: #FFF;
}

.calculator.btn-question, .btn-question:focus {
  z-index: 100;
  position: absolute;
  top: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  border-radius: 40px;
  background: transparent;
  border: 2px solid #FFF;
  padding-top: 6px;
  color: #FFF;
  font-family: sans-serif;
  font-size: 18px;
  outline: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.calculator.btn-question:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #FFF;
}

.calculator:focus {
  outline: none !important;
} 

.calculator::-moz-focus-inner {
  border: 0 !important;
}

.calculator .btn{
  width: 33%;
}

/* MEDIA QUERIES */

@media only screen and (max-width: 768px) {


  .container {
    width: 85%;
  }
  .btn-calc, .clear, .btn-calc:focus, .clear:focus {
    width: 80px;
    height: 80px;
  }
}

@media only screen and (min-width: 1440px) {
  .container {
    width: 85%;
  }
  .btn-calc, .clear, .btn-calc:focus, .clear:focus {
    width: 80px;
    height: 80px;
  }
}

.hvr-radial-out:before {
  background: #FFF !important;
  border-radius: 100%;
  transition-duration: 0.5s;
}

.hvr-fade:before {
  background: #FFF !important;
  transition-duration: 0.5s;
}


.operationSide button{
  font-size: 16px;
  padding: 5px 15px;
  display: inline-block;
  width: 15%;
  box-sizing: border-box;

}

.operationSide button:hover{
  background: #888;
  color: #fff;

}