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

h1 {
    text-align: center;
    color: #333;
}
.container {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    width: 80%;
    max-width: 600px;
}

table {
    margin: 0 auto;
    border-collapse: collapse;
    border-color: black;
}

th, td {
    border: 1px solid black;
    padding: 10px;
    text-align: center;
}

th {
    background-color: #3498db;
    color: black;
}

.instrument {
    width: 140px;
    height: auto;
}

.play-method {
    padding: 5px;
    font-size: 16px;
    border: 2px solid black;
    border-radius: 5px;
    background-color: #fff;
    color: #333;
}

.play-method:focus {
    outline: none;
    border-color:black;
}

.validation {
    font-size: 20px;
}

.validation.correct::before {
    content: '\2713'; /* Checkmark symbol */
    color: green;
}

.validation.incorrect::before {
    content: '\2717'; /* Cross symbol */
    color: red;
}

button {
    display: inline-flex;
    margin: 20px auto;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 5px;
    background-color: palegreen;
    color: black;
    cursor: pointer;
    transition: background-color 0.3s;
    border-color: black;
}

button:hover {
    background-color: green;
}