*, *::before, *::after{
    box-sizing: border-box;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    font-weight: normal;
 

}
body{
    background-color: aqua;
    padding: 0;
    margin: 0;
    padding-top: 50px;

}
.calculator{
    display: grid;
    justify-content: center;
    align-content: center;
    
    /* min-height: 60vh; */
    grid-template-columns: repeat(4, 80px);
    grid-template-rows: minmax(80px, auto) repeat(5, 80px);
    
}
.calculator  button{
    cursor: pointer;
    border: 1px solid white;
    outline: none;
    background-color: rgba(212, 145, 145, 0.75);
}
.calculator > button:hover{
    background-color: rgba(254, 119, 119, 0.75);
}
.span-two{
    grid-column: span 2; 
}
.output {
   
    grid-column: 1 / -1;
    background-color: rgba(0, 0, 0, 0.75);
    color: white;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-direction: column;
    padding: 10px;
    word-wrap: break-word;
    word-break: break-all;

}
.output .previous-operand{
    color: rgba(212, 201, 217, 0.75);
    font-size: 1.5rem;
}
.output .current-operand{
    color: rgba(255, 255, 255, 0.75);
    font-size: 2.5rem;
}