body {
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: #f0f8ff;
    margin: 0;
    padding: 20px;
}

h1 {
    font-size: 2.5em;
    color: #333366;
}

.button-container {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 2px 2px 10px #888888;
    max-width: 600px;
    margin: auto;
}

.exercise {
    font-size: 1.5em;
    margin-bottom: 20px;
}

button {
    margin: 10px;
    padding: 10px 20px;
    font-size: 1.2em;
    background-color: #333366;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background-color: #555599;
}

.solution {
    display: none;
    background-color: #e6f7ff;
    padding: 15px;
    border-radius: 5px;
    margin-top: 10px;
    font-size: 1.2em;
    text-align: left;
    width: 100%;
    box-sizing: border-box;
    white-space: pre-wrap;
    overflow-x: auto;
    max-height: 500px;
}