html, body
{
    height: 100%;
    margin: 0;
    padding: 0px;
    overflow: hidden;
}
.top-bar {
  background: #333;
  color: #fff;
  padding: 1px;
}

.btn {
  background: coral;
  color: #fff;
  border: none;
  outline: none;
  cursor: pointer;
  padding: 0.7rem 1px;
}

.btn:hover {
  opacity: 0.9;
}

.page-info {
  margin-left: 1rem;
}

.error {
  background: orangered;
  color: #fff;
  padding: 1rem;
}
canvas {
	padding:0px;
	width:80%;
	height:450px;
	margin:auto;
	}
.loader {
    position: fixed;
    z-index: 99;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader > img {
    width: 300px;
}

.loader.hidden {
    animation: fadeOut 1s;
    animation-fill-mode: forwards;
}

@keyframes fadeOut {
    100% {
        opacity: 0;
        visibility: hidden;
    }
}

</style>