stylesheet.css

.body {
    margin: 0;
    padding: 0;
    font-family: "Orbitron", sans-serif;
}

.calculator {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    position: absolute;
    width: 66vh;
    height: 66vh;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    border-radius: 10px;
    border: 5px solid black;
    margin: auto;
    padding: 10px;
}

.display {
    display: grid;
    align-items: center;
    grid-column: 1/4;
    border: 2px solid black;
    border-radius: 5px;
    text-align: right;
    vertical-align: middle;
    font-size: 16px;
    font-family: "Orbitron", sans-serif;
    font-weight: 500;
    padding-right: 10px;
    min-height: 4vh;
}

.btn {
    font-size: 16px;
    font-family: "Orbitron", sans-serif;
    font-weight: 900;
}

.operator {
    color: blue;
}

.clear, .back {
    color: red;
}