#first{
    
    background-color: aqua;
}
body{
    text-align: center;
}
#second{
    background-color: aqua;
}
button{
    margin: 15px;
}
.result{
    margin: 54px;
}
#operator{
    background-color: yellow;
    font-size: large;
}

#result{
    background-color: gold;
}