body {
  background-image: url("menu_bg.png");
  background-size: 461px;
  animation: moveIt 20s linear infinite;
}
@keyframes moveIt {
  from {background-position: top right;}
  to {background-position: bottom left;}
}
p {
  position:fixed;
  left: 50%;
  color: black;
  margin-right: auto;
  margin-left: auto;
  text-align: righ;
}
h1 {
  font-weight: bold;
}
.side-header {
    position:fixed;
    width: 1;
    height: 100%;
    top: 0;
    left: 15%;
}
.sider-head {
  position:fixed;
  width: 20%;
  height: 100%;
  top: 0;
  left: 0%;
}
.side-logo {
  position:fixed;
  width: 1;
  height: 60%;
  top: 5%;
  left: 10%;
}
.back-to-index {
  font-size:15px;
  color: lime;
  text-align: right;
  display: block;
}