styles.css

.calculator {
    position: relative;
    top: 70px;
    font-size: 20px;
    height: 700px;
    width: 550px;
    margin: auto;
    background: darkgrey;
    border-radius: 25px;
}

.display {
    width: 500px;
    height: 80px;
    background-color: white;
    margin: auto;
    text-align: right;
    position: relative;
    top: 40px;
    border-radius: 10px;
}

.displayText {
    font-size: 50px;
    position: relative;
    top: 8px;
    right: 5px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(5, 1fr);
    height: 500px;
    width: 500px;
    margin: auto;
    position: relative;
    top: 80px;
}

.zero {
    grid-column-start: 1;
    grid-column-end: 3;
}

.selected {
    background-color: bisque;
}

.backspace-img {
    width: 30px;
    height: 30px;
    opacity: 0.7;
}

button {
    font-size: 30px;
    background-color: white;
}

.operator {
    background-color: red;
    color: white;
}

.number {
    background-color: navy;
    color: white;
}

.zero {
    background-color: white;
    color: black;
}

.divide {
    background-color: white;
    color: black;
}