body
{
    font-family: Arial, Helvetica, sans-serif;
    overflow: hidden;
    margin: 0px;
}

button
{
    background-color: blue;
    color: white;
    font-size: 18px;
    text-align: center;
    text-decoration: none;
    opacity: 0.7;
    border: 1px solid black;
    display: inline-block;
    transition: 0.3s;
    padding: 10px 0px;
}

button:hover
{
    opacity: 1;
}

canvas
{
    border: 1px solid black;
}