body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f0f0f0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0;
}

.language-switcher {
    position: relative;
}

#language-select {
    padding: 5px;
    border-radius: 3px;
}

main {
    margin-top: 20px;
    background-color: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.level {
    margin-bottom: 20px;
}

.level h2 {
    border-bottom: 1px solid #ccc;
    padding-bottom: 10px;
    margin-bottom: 10px;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    display: flex;
    align-items: center;
    margin-bottom: 5px;
}

input[type="checkbox"] {
    margin-right: 10px;
}