body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: #f4f4f4;
    margin: 0;
}

h1 {
    color: #333;
}

.instrument-tuner,
.guitar-tuner {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    text-align: center;
}

.instrument-tuner label {
    margin-right: 10px;
    font-size: 1.1em;
}

.instrument-tuner input[type="number"] {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1em;
    width: 80px;
    text-align: center;
}

.instrument-tuner button,
.guitar-tuner button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1em;
    margin: 5px;
    transition: background-color 0.2s ease;
}

.instrument-tuner button:hover,
.guitar-tuner button:hover {
    background-color: #0056b3;
}

.guitar-tuner button {
    width: 120px;
}

.guitar-tuner h2 {
    color: #555;
    margin-top: 0;
}