body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
}

.button-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-y: auto;
    height: 300px;
    padding: 20px;
    border: 1px solid #ccc;
    background-color: #fff;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn {
    margin: 5px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    border: none;
    background-color: #007bff;
    color: white;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.btn:focus {
    outline: none;
    background-color: #0056b3;
    transform: scale(1.1);
}

.btn:not(:focus) {
    background-color: #007bff;
}