.number {
 background-color: violet;
}

.operator {
    background-color: blueviolet;
}
.solve {
    background-color: aquamarine;
}
.reset {
    background-color:bisque;
}
input {
    padding: 30px;
    margin: 6px;
    width: 120px;
    border-radius: 15px;
    font-size: inherit;
}

#calculationOutput {
    width: 480px;
    text-align: center;
}
#calculationOutput:hover {
    opacity: 1;
}
body {
    text-align: center;
    font-size: 3em;
}

input:hover {
    opacity: 0.5;
}