#speed-tool {
    margin: 20px;
    padding: 10px;
    border: 1px solid #ddd;
    background: #f9f9f9;
}
#check-speed {
    padding: 10px 20px;
    background: #0073aa;
    color: #fff;
    border: none;
    cursor: pointer;
}
#check-speed:hover {
    background: #005177;
}
canvas {
    margin-top: 20px;
    max-width: 100%;
}