body{
margin: 0;
padding: 0; 
background: white;
 display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.container{
 background:whitesmoke;
  width: 400px;
  height: 550px;  
  border: 4px solid white;
  border-radius: 20px;     
}
.unit{
    display: flex;
    border-radius: 20px 20px 0 0;
    justify-content: center;
    flex-direction: column;
    align-items: center; 
    background:darkcyan;    
}
h1{
    font-size: 15px;
    font-family:'Times New Roman', Times, serif;
    color: white;
    font-weight: bold;
    padding: 10px;
    
}
input{
    width: 50px;   
    background:darkcyan;
    padding: 10px;
    border-radius: 4px;
    border: white 2px solid;
    color: white; 
     text-align: center;
    
}
button{
    padding: 7px;
    border-radius: 5px;
    border: none;
    margin: 15px;
}

.output{
  border:2px solid white;
height: 80px;
background: white; 
margin:20px; 
 display: flex;
justify-content: center;
 flex-direction: column;
   
}
h2{
    font-size: 20px;
    text-align: center; 
}
p{
    text-align: center;
    font-size: 15px;
}