header{
background-color: DDFFBB;
color:darkbrown;
position:fixed;
text-align:center;
width:100vw;}

details{
  margin:100px;
  padding:50px;  
}
header{
  background-color:pink;
  padding:0.105rem;
  text-align:center;  
}
nav{
  background-color:rgb(10,10,10);
}