.Cal { width: 100%; margin-bottom: 15px; }
body { background-image: url("https://otherapi.hedongfu.com/images/fish_04_1920X1080.jpg"); background-size: cover; -webkit-background-size: cover; background-repeat: no-repeat; background-attachment: fixed; }
#home { background-color: rgba(255, 255, 255, 0.7); }
#home:hover {background-color: rgba(255, 255, 255, 0.9)}