h3
{
    font-size: 25px !important ;
}

.btn-success:hover
{
  background-color:blue;
}

canvas {
    margin-top:80px;
    border: 2px red;
    animation-name: changing_colours;
    animation-duration: 3.5s;
    animation-iteration-count: infinite;
}

@keyframes changing_colours {
    from{ box-shadow:2px 2px 20px maroon ;}
    to{ box-shadow:2px 2px 20px violet ;}
}