html, body{
    height: 100vh;
    background:linear-gradient(to right, #c5c7d4, #473e4f);
    font-family: 'Orbitron';  
}
body{
    display: flex;
    align-items: center;
    justify-content: center;
}
#calc-border{
    background-color: white;
    height:390px;
    width:250px;
    margin-bottom: 40px;
    font-size: 20px;
    position: relative;
}
#screen1{
    margin-top: 10px;
    text-align: center;
    color: #36454F;
    width: 250px;
    height: 25px;
}
#screen{   
    text-align: center;
    color:  #36454F;
    width: 250px;
    height: 25px;  
}
.bottom{
    bottom: 0;
    position: absolute;
    width: 250px;
    height: 25px;
    background-color: #e4324c;
}

.calc {
    width:300px;
    align-items: center;
    position: absolute;
    background-color:#763f5f;
    opacity: 0.97; 
}
.btn, .btnOp, .btnEq, .clrBtn, .del{
  margin: 10px;
  width:50px;
  height: 40px;
  border-radius: 0px;
  border: none;
  background:none;
  color: white;
  font-size:17px; 
  font-family: 'Orbitron';
  cursor: pointer;
}