.calculator {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.num-row>button {
    background-color: lightblue;
}

.op-container>button {
    background-color: lightpink;
}

#clear, #enter {
    background-color: lightyellow;
}

#results {
    height: 50px;
    width: 100px;    
    background-color: lightcoral;
}