/* Center the button on the page */
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: #181818;
    margin: 0;
}

#play-btn {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(145deg, #444 60%, #222 100%);
    box-shadow: 0 4px 24px rgba(0,0,0,0.3), 0 1.5px 0 #222 inset;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: box-shadow 0.2s, background 0.2s;
    outline: none;
}

#play-btn:hover {
    box-shadow: 0 8px 32px rgba(0,0,0,0.5), 0 2px 0 #222 inset;
    background: linear-gradient(145deg, #555 60%, #333 100%);
}

#play-btn::before {
    content: '';
    display: block;
    width: 0;
    height: 0;
    border-left: 32px solid #fff;
    border-top: 20px solid transparent;
    border-bottom: 20px solid transparent;
    margin-left: 8px;
}