nav{
    background-color: rgb(188, 234, 250);
    text-align: center;
    padding: 10px;
    position: fixed;
    top: 0;
    right:0;
    left: 0;
}

header{
    background-color:rgb(205, 248, 248) ;
    font-size: 21px;
    padding: 20px;
    text-align: center;
}
body{
    font-family: Arial, Helvetica, sans-serif;
    font-size: 18px;
    padding: 10px;
    text-align: center;
    background-color: rgb(237, 244, 251);
}

a:hover{
  color: red;
  transition: color 0.5s;
}

 #video iframe{
  width: 100%;
  max-width: 560px;
  height: auto;
  aspect-ratio: 16/9;
 }

 footer{
  padding-top: 5px;
  background-color:rgb(205, 248, 248);
  padding-bottom: 5px;
}