body {
    background-color: black;
    color: white;
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 20px;
}
h1 {
    font-size: 3em;
}
button {
    padding: 10px 20px;
    margin: 10px;
    border: none;
    border-radius: 5px;
    font-size: 1.2em;
    cursor: pointer;
}
.level-button {
    width: 200px;
}
#beginner {
    background-color: teal;
}
#intermediate {
    background-color: yellow;
    color: black;
}
#advanced {
    background-color: red;
}
#options button {
    display: block;
    width: 80%;
    margin: 10px auto;
    background-color: #333;
    color: white;
}
#next {
    background-color: #444;
    color: white;
}
#share {
    background-color: #1DA1F2;
    color: white;
}
.progress {
    background-color: #333;
    height: 5px;
    margin: 20px 0;
}
.progress-bar {
    background-color: teal;
    height: 100%;
}
#logo {
    width: 100px;
    margin-bottom: 20px;
}
a {
    color: #1DA1F2;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}