body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
}
.calculator {
    background-color: #41435A;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0px 0px 20px rgba(0, 0, 0, 0.5);
    width: 300px;
}
.display {
    background-color: #ECF0F1;
    border-radius: 10px;
    padding: 20px;
    font-size: 24px;
    text-align: right;
    margin-top: 10px;
    margin-bottom: 20px;
    height: 80px;
    color: #2C3E50;
    overflow: hidden;
}
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}
.button {
    background-color: #2C3E50;
    border: none;
    border-radius: 50%;
    color: #ECF0F1;
    font-size: 24px;
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
}
.button:hover {
    background-color: #1A252F;
}
.button.orange {
    background-color: #FF806F;
    border-radius: 10px;
    width: 100%;
    grid-column: span 3;
    height: 55px;
    margin-top: 10px;
}