body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background-color: #2f2d2d
}

.container {
    text-align: center;
    padding: 20px;
    border: 2px solid lightslategrey;
    border-radius: 12px;
    background: darkslategrey;
}

input {
    width: 60px;
    margin: 5px;
    padding: 5px;
    text-align: center;
}

button {
    margin: 10px 5px;
    padding: 10px 15px;
    cursor: pointer;
    border: none;
    border-radius: 6px;
}

#startBtn {
    background: greenyellow;
    color: white;
}

#stopBtn {
    background: red;
    color: white;
}

#display {
    font-size: 2rem;
    margin-top: 20px;
}

#message {
    font-size: 1.5rem;
    margin-top: 15px;
    color: gold;
}