body {
  background-color: #393939;
}

#nav {
  color: #a4c7b8;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: 'Roboto', sans-serif;
  margin: 0px 7.5px;
}

.button {
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  width: 60px;
  height: 60px;
  background-color: #666666;
  border-radius: 45%;
  box-shadow: 3px 4px 2px black;
}

.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: 12px 12px;
  justify-content: center;
  align-items: center;
}

#display {
  display: flex;
  flex-direction: column-reverse;
  text-align: right;
  background-color: #3b3b3b;
  height: 90%;
  width: 95%;
  margin: auto;
  box-shadow: 2px 2px 5px inset;
  border-radius: 20px;
}  

#display p {
  margin: 0;
  margin-right: 20px;
}  

.input {
  font-size: 12px;
  color: #7b7b7b;
  font-family: 'Roboto', sans-serif;
  
}  
  
.result {
  color: #a4c7b8;
  font-size: 52px;
  font-family: 'Roboto', sans-serif;
  text-shadow: 0px 0px 3px;
}
  
.calc-body { 
  height: 600px;
  width: 300px;
  background-color: #2b2b2b;
  box-shadow: 5px 5px 10px black, -2px 5px 10px gray inset;
  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 {
  
}