.calculator_top {
  width: 400px;
  font-size: 18px;
  background-color: #d2cebd;
  color: #504037;
  padding: 4px;
  border: 1px solid #e6caba;
}
.calculator {
  background-color: #e0dccb;
  width: 400px;
  font-size: 16px;
  color: #504037;
  padding: 4px;
  border-left: 1px solid #e6caba;
  border-right: 1px solid #e6caba;
  border-bottom: 1px solid #e6caba;
  margin-bottom: 10px;
}
.calculator .number_inp {
  background: #fff;
  border: 2px solid #504037 !important;
  border-radius: 4px;
  line-height: 28px;
  margin-right: 3px;
  padding: 0 8px;
  text-align: center;
  width: 70px;
}
.calculator .arrow__ {
  border: solid black;
  border-width: 0 4px 4px 0;
  display: inline-block;
  padding: 4px;
  margin-right: 10px;
}
.calculator .right__ {
  transform: rotate(-45deg);
  -webkit-transform: rotate(-45deg);
}
.calculator .result__ {
  text-decoration: underline;
}