CSS讓一張圖片作爲背景圖片填充整個屏幕

background-image: url('../../static/img/back-img.png');
		width: 100%;
		height: 100%;
		position: fixed;
		background-repeat: no-repeat;
		background-position: 0px 0px;
		background-size: 100% 100%;
		font-size: 30upx;

CSS樣式如上圖