body { padding: 0; margin: 0; }
.sky { background-color: #70C0F8; width: 100vw; height: 100vh; background-image: url('../images/bg-sky.png'); background-repeat: repeat-x; background-position: left bottom; position: relative; }

.sky canvas { position: absolute; left: 0; top: 0; width: 100%; height: 100%; }