home h1{
font-size:45px;
}

body{
background-image: url('//images.cnblogs.com/cnblogs_com/freedom-2018/1864072/o_2010150934083.jpg');
background-size: cover;
 background-repeat: no-repeat; 
background-attachment: fixed;
 background-origin: initial; 
background-clip: initial; 

height:100%;
width:100%;
}

home{
opacity:1;
}
.wall{
position: fixed;
top: 0;
left: 0;
bottom: 0;
right: 0;
}

div#top{
background: url("//images.cnblogs.com/cnblogs_com/JobsOfferings/1363202/o_ed86aac6.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%;
}
}

pre {
margin-top: 0;
margin-bottom: 0;
background-color: rgba(245, 245, 245, 1);
padding: 0px;
border-radius: 11px;
overflow-x: scroll;
}