#home h1{
    font-size:45px;
}
body{
background-image: url("https://images.cnblogs.com/cnblogs_com/jiuzhongxian/1640220/o_200201103752e3c600b085a0d3451d3b8a8a48461c45.jpg"); background-position: initial; background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-origin: initial; background-clip: initial;
height:100%;
width:100%;
}
#home{
    opacity:0.7;
}
.wall{
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}
div#midground{
    background: url("https://i.postimg.cc/PP5GtGtM/midground.png");
    z-index: -1;
    -webkit-animation: cc 200s linear infinite;
    -moz-animation: cc 200s linear infinite;
    -o-animation: cc 200s linear infinite;
    animation: cc 200s linear infinite;
}
div#foreground{
    background: url("https://i.postimg.cc/z3jZZD1B/foreground.png");
    z-index: -2;
    -webkit-animation: cc 253s linear infinite;
    -o-animation: cc 253s linear infinite;
    -moz-animation: cc 253s linear infinite;
    animation: cc 253s linear infinite;
}
div#top{
    background: url("https://i.postimg.cc/PP5GtGtM/midground.png");
    z-index: -4;
    -webkit-animation: da 200s linear infinite;
    -o-animation: da 200s linear infinite;
    animation: da 200s linear infinite;
}
@-webkit-keyframes cc {
    from{
        background-position: 0 0;
        transform: translateY(10px);
    }
    to{
        background-position: 600% 0;
    }
}
@-o-keyframes cc {
    from{
        background-position: 0 0;
        transform: translateY(10px);
    }
    to{
        background-position: 600% 0;
    }
}
@-moz-keyframes cc {
    from{
        background-position: 0 0;
        transform: translateY(10px);
    }
    to{
        background-position: 600% 0;
    }
}
@keyframes cc {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 600% 0;
    }
}

@keyframes da {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 0 600%;
    }
}
@-webkit-keyframes da {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 0 600%;
    }
}
@-moz-keyframes da {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 0 600%;
    }
}
@-ms-keyframes da {
    0%{
        background-position: 0 0;
    }
    100%{
        background-position: 0 600%;
    }
}

/*鼠标跟随效果*/
<style type="text/css">
    .draw {
        position: fixed;
        width: 1px;
        line-height: 1px;
        pointer-events: none;
    }
    @keyframes floatOne {
        0% {
                    opacity:1;
        }
        50% {
                    opacity:1;
        }
        100% {
                    opacity:0;
            transform:translate3D(0, -20px, 0) scale(5) rotate(45deg);
        }
    }
</style>
<script type="text/javascript">
    var H = 0;
    $(document).bind('mousemove touchmove',function(e) {
        e.preventDefault();
        var drawSize = 10;
        var drawType = '♡';
        var floatType = 'floatOne';
        var xPos = e.originalEvent.pageX;
        var yPos = e.originalEvent.pageY;

        $('body').append('<div class="draw" style=" font-size:'+drawSize+'px;left:'+xPos+'px;top:'+yPos+'px;-webkit-animation:'+floatType+' .9s 1;-moz-animation:'+floatType+' .9s 1;color:#FF83FA;">'+drawType+'</div>');

        $('.draw').each(function() {
            var div = $(this);
            setTimeout(function() {$(div).remove();},800);
        });
    });
</script>