body {
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
    background-color: #f7f7f7;
    color: #333;
    text-align: center;
}

#app {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
}

h1 {
    color: #4a4a4a;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 15px 30px;
    margin: 10px;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

button:hover {
    background-color: #0056b3;
}

button:active {
    box-shadow: 0 5px #666;
    transform: translateY(4px);
}

#testButton {
    font-size: 20px;
    padding: 20px 40px;
}

#customTime {
    border: 2px solid #ddd;
    border-radius: 5px;
    padding: 10px;
    margin-bottom: 20px;
}

#speedDisplay {
    margin-top: 20px;
    font-size: 20px;
}