* {
    box-sizing: border-box;
}
body {
padding: 0;
margin: 0;
}
.calc {
  width: 400px;
  background-color: black;
  color: white;
  
}
.screen {
  font-size: 40px;
  font-family: "Courier New", Courier, monospace;
  text-align: right;
  padding: 20px 5px;
 
}
.calc-button {
  background-color: #d8d9db;
  color: black;
  height: 100px;
  width: 24.5%;
  border: none;
  border-radius: 8;
  font-size: 30px;
  cursor: pointer;
  
}
.calc-button:hover {
  background-color: #ebebeb;
}
.calc-button:active {
  background-color: #bbbcbe;
}
.calc-button:last-child{
    background-color: #df974c;
    color: white;
}
.calc-button:last-child:hover{
    background-color: #dfb97e;
}
.calc-button:last-child:active{
    background-color: #dd8d37;
}
.double {
  width: 50%;
}
.calc-row {
  display: flex;
  align-content: stretch;
  justify-content: space-between;
  margin-bottom: 0.5%;
  
}