body {
opacity: 0.95;
background: url(https://images.cnblogs.com/cnblogs_com/ycgod/1582349/o_ChMkJlbKwhCIeE9LAAhgTiIIyGkAALGiQFBrYcACGBm095.jpg) fixed;

background-size: cover;

background-repeat: no-repeat;


}