.calculator {
  margin-bottom: 50px;
}

form > div {
  margin-bottom: 20px;
}

h2 {
  padding: 20px 0;
}

.calculator {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  margin-top: 50px;
}

.result-area {
  display: flex;
  flex-direction: column;
  padding: 50px;
  background-color: #fff;
  border-radius: 0 18px 18px 0;
}

form {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 50px;
  border: 1px solid #fff;
  border-radius: 18px 0  0 18px  ;
}

.result {
  width: 150px;
  padding: 20px;
  margin-bottom: 20px;
  background-color: var(--main-bg-color);
}

.surface-area {
  display: grid;
  grid-template-columns: 2fr 2.5fr 2.5fr 1fr 0.5fr 0.5fr;
  gap: 10px;
  align-items: center;
  text-align: left;
  margin-bottom: 20px;
}

.height,
.width,
select {
  width: 100%;
  height: 50px;
  padding-left: 10px;
  font-family: inherit;
  font-size: 16px;
  background-color: #fff;
  border-style: none;
  border-radius: 8px;
  box-shadow: 2px 4px 12px rgba(0, 0, 0, 0.08);
}

.btn {
  font-family: inherit;
  font-size: 16px;
  margin-bottom: 0;
}

.add-surface {
  width: 300px;
  margin: 0 auto 40px auto;
  text-align: center;
}

select {
  width: 80%;
  padding: 10px;
  margin: 20px auto 0 0;
  cursor:pointer;
  color: inherit;
}

.result-surface {
  display: inline-flex;
  margin: 20px 0;
}

.result-surface p {
  padding: 0 5px;
}

.result-num {
  display: inline-flex;
  margin-top: 10px;
}

.result-num p {
  padding-right: 5px;
}

.height:invalid,
.width:invalid {
  border: solid 1px red;
}

.descript {
  margin-bottom: 50px;
}

.product-select-area {
  margin-bottom: 40px;
}

.product-rashod {
  margin-bottom: 10px;
}
.product-rashod p {
  padding-right: 5px;
}