body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #4acfd9;
    margin: 0;
}

.title {
    text-align: center;
    font-size: 36px;
    color: #1a3d7c;
    margin-bottom: 25px;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 800;
}


.calculator {
    width: 280px;
    background: white;
    padding: 20px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0px 10px 20px rgba(0, 0, 0, 0.15);
}



#display {
    width: 100%;
    height: 70px;
    font-size: 2rem;
    text-align: right;
    padding: 10px;
    margin-bottom: 15px;
    border: none;
    background: white;
    color: black;
    outline: none;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

button {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    outline: none;
    transition: 0.2s;
    background: #f8f8f8;
    color: black;
}

button:active {
    opacity: 0.7;
}

.operator {
    color:#4CAF50;
}

.clear {
    color: red;
    font-weight: bold;
}


.equals {
    background: green;
    color: white;
    border-radius: 50%;
    font-weight: bold;
}