body {
  background: url("https://images.unsplash.com/photo-1571566882372-1598d88abd90?q=80&w=687&auto=format&fit=crop&ixlib=rb-4.1.0&ixi=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D") top left no-repeat, black;
  color:lightgrey;
}


hidden {
  display:none;
  background-color:lightblue;
  margin-left: 20px;
  padding:10px;
  color:black;
}

#all:hover hidden {
  display:block;
  margin-bottom:30px;
}

#container {
  width:80%;
  margin:auto;
  background: rgb(100,100,100,10);
  padding:20px;
}

input:focus {
  background-color: yellow;
}

p1 {
  padding:5px;
  border: 2px solid black;
  outline: 10px solid Lightblue;
  outline-offset: 10px 10px 2px;
  clear:left;
}

form {
  margin-top:30px;
}

img {
  z-index: -1;
}