body {
    background: radial-gradient(circle at center, #0f2027, #203a43, #2c5364);
    color: white;
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.speed-container {
    text-align: center;
    background: rgba(255,255,255,0.1);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 0 20px rgba(0,0,0,0.4);
    width: 90%;
    max-width: 420px;
}

h1 {
    margin-bottom: 10px;
}

.main-speed {
    font-size: 2.8em;
    margin: 20px 0;
}

#startBtn {
    padding: 10px 25px;
    background: #00bcd4;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 1.2em;
}

#startBtn:hover {
    background: #0097a7;
}

.results {
    margin-top: 20px;
    font-size: 1.1em;
}

canvas {
    margin: 10px auto;
    display: block;
}