body {
    background-color: rgb(129, 176, 218);
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width: 100vw;
    height: 100vh;
    margin: 0;
}


.main {
    background: #222;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    align-items: center;
}


#display {
    width: 100%;
    height: 50px;
    font-size: 24px;
    text-align: right;
    margin-bottom: 10px;
    padding: 5px;
    border: none;
    border-radius: 5px;
    background-color: white;
    box-shadow: inset 0px 2px 5px rgba(0, 0, 0, 0.2);
}


button {
    background-color: grey;
    color: white;
    padding: 10px;
    border-radius: 6px;
    border: 2px solid black;
    margin: 5px;
    width: 50px;
    height: 50px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.3);
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: #555;
}


.clear-btn {
    width: 100%;
    background-color: red;
    color: white;
    font-size: 18px;
}