body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

button {
    width: 100%;
    height: 60px;
    font-family: 'Orbitron', serif;
    font-size: 24px;
    border: none;
    background-color: #f5f5f5;
    border-radius: 10px;
    cursor: pointer;
}

button:active {
    background-color: #e0e0e0;
}

#display {
    width: 275px;
    height: 40px;
    font-family: 'Orbitron', sans-serif;
    font-size: 24px;
    text-align: right;
    margin-bottom: 10px;
    padding-left: 10px;
    padding-right: 10px;
}

.calculator {
    width: 300px;
    margin: auto;
    padding: 20px;
    border: 2px solid #ccc;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 25px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(6, 1fr);
    gap: 10px;
}

.clear {
    background-color: #ff6464;
    grid-column: span 2;
}

.clear:active {
    background-color: #e04444;
}

.delete {
    background-color: #8193af;
    grid-column: span 2;
}

.delete:active {
    background-color: #4d6a9c;
}

.operator {
    background-color: #f0a500;
}

.operator:active {
    background-color: #d08e00;
}

.zero {
    grid-column: span 2;
}

.equal {
    background-color: #55c43e;
    grid-column: span 4;
}

.equal:active {
    background-color: #449833;
}