body {
  background-color: #393939;
}

#nav {
  color: #a4c7b8;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#display {
  background-color: #3b3b3b;
  height: 100%;
  width: 95%;
  margin: auto;
  box-shadow: 5px 5px 5px #616161 inset;
  border-radius: 20px;
}

.button{
  width: 60px;
  height: 60px;
  margin: auto;
  background-color: #666666;
  border-radius: 45%;
}

.plus {
  height: 140px;
  grid-column-start: 4;
  grid-row-start: 4;
  grid-row-end: 6;
  border-radius: 50px;
}

#btn-grid {
  display: grid;
  grid-template-columns: auto auto auto auto;
  grid-template-rows: auto auto auto auto auto;
  width: 95%;
  height: 100%;
  margin: auto;
  margin-top: 10px;
  grid-gap: 5px 5px;
}

.calc-body {
  height: 600px;
  width: 300px;
  background-color: #2b2b2b;
  display: flex;
  align-items: center;
  border-radius: 20px;
  margin: auto;
  margin-top: 10%;
}

.inner-grid {
  height: 90%;
  width: 100%;
  display: grid;
  grid-template-rows: 1fr 4fr 12fr;
}

.main-row {
  border: 1px solid teal;
}