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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(145deg, seagreen, darkblue);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculator {
    width: 260px;
    background: #1e1e1e;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 8px 20 px rgba(0,0,0,0.3);
}

#display {
    width: 100%;
    height: 50px;
    font-size: 22px;
    text-align: right;
    padding: 10px;
    margin-bottom: 12px;
    border-radius: 8px;
}

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

button {
    padding: 15px;
    font-size: 18px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background: #333;
    color: white;
    transition: 0.2s;
}

button:hover {
    background: #555;
}

button:active {
    transform: scale(0.95);
}

button:nth-child(1) {
    background: #ff4d4d;
}

button:nth-child(15) {
    background: #00c853;
}

#jyoti {
    position: absolute;
    top: 70px;
}