body
{
font-family: cursive;
background-size: cover;
}
.header
{
    width: 100%;
    top: 0px;
    height: 50px;
    margin: 0px;
    font-size: 20px;
}
.footer
{
    text-align: center;
    bottom: 0px;
    background-color: gray;
    position: fixed;
    width: 100%;
    height: 25px;
    font-size: 18px;
}

canvas
{
    border: 2px solid wheat;
    border-radius: 10px;
    animation-name: example;
    animation-duration: 4s;
    animation-iteration-count: infinite;
    margin-top: 100px;
}
@keyframes example {

    from {box-shadow: 1px 1px 38px red;}
    to {box-shadow: 1px 1px 38px green;}
    
    }