body {
    font-family: Arial, sans-serif;
    background: #04bbdf;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.calculator {
    background: #beedf4;
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

#display {
    width: 95%;
    height: 50px;
    font-size: 24px;
    text-align: right;
    margin-bottom: 10px;
    padding: 10px;
    border: none;
    border-radius: 8px;
    background-color: aqua;
    color:#04bbdf;
}

.buttons{
    display: grid;
    grid-template-columns: repeat(4, 60px);
    gap: 10px;
}

button {
    height: 50px;
    font-size: 18px;
    border: none;
    background: aqua;
    color: #04bbdf;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover {
    background: #7aa4b3;
}

button.zero {
    grid-column: span 2;
}