* {
    margin: 0;
    padding: 0;
}
html, body {
    width: 100%;
    height: 100%;
}
.main {
    margin-top: 10px;
    display: flex;
    align-items: center;
    flex-direction: column;
    width: 100%;
    height: 100%;
}
.canvas {
    background-color: lightblue;
}