* {
    box-sizing: border-box;
    margin: 0;
}

body {
    background-color: burlywood;
    display: flex;
    justify-content: center;
    height: 100vh;
    align-items: center;
    font-family: 'Courier New', Courier, monospace;
}

.calculator {
    background-color: beige;
    padding: 20px;
    max-width: 400px;
    margin: 0 auto;
    border: solid 1px #CCC;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    border-radius: 10px;
}

#result {
    background-color: white;
    width: 100%;
    padding: 10px;
    font-size: 24px;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3) inset;
    border-radius: 5px;
    pointer-events: none;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 10px;
    margin-top: 10px;
}

button {
    padding: 10px;
    font-size: 24px;
    border: none;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    border-radius: 5px;
    transition: 0.5s;
}

button:hover {
    background-color: white;
}

.clear {
    background-color: rgb(255, 43, 43);
    color: white;
}

.clear:hover {
    background-color: rgba(255, 43, 43, 0.651);
    color: black;
}

.operator {
    background-color: #0074d9;
    color: white;
}

.operator:hover {
    background-color: #0074d99d;
    color: black;
}

.equals {
    background-color: #01ff70;
    grid-row: span 3;
    color: white;
}

.equals:hover {
    background-color: rgba(97, 253, 165, 0.623);
    color: black;
}