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

h1:hover {
    color: rgb(255, 210, 142);
    transition: color 0.3s ease-in-out;
}

#display {
    max-width: 600px;
    font-size: 3em;
    margin-bottom: 20px;
    background-color: rgb(255, 210, 142);
    color: black;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0px 5px 15px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease-in-out;
}

#display:hover {
    background-color: rgb(0, 0, 0);
    color: rgb(255, 210, 142);
}

.buttons {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

button {
    padding: 10px 20px;
    font-size: 1.2em;
    color: white;
    background-color: #4CAF50;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s ease-in-out, transform 0.2s ease-in-out;
}

button:nth-child(1) {
    background-color: #4CAF50; /* Green */
}

button:nth-child(2) {
    background-color: #2196F3; /* Blue */
}

button:nth-child(3) {
    background-color: #f44336; /* Red */
}

button:nth-child(4) {
    background-color: #ffeb3b; /* Yellow */
    color: black;
}

button:hover {
    transform: scale(1.1) rotate(1deg);
    animation: shake 0.3s ease-in-out;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-5px);
    }
    50% {
        transform: translateX(5px);
    }
    75% {
        transform: translateX(-5px);
    }
}

button:active {
    transform: scale(1.05);
    background-color: #333;
}