header img{
    width: 200px;
    display:block;
    position: relative;
}
header button{
    background-color: black;
    padding:10px
}
header a{
    color: white;
    text-decoration: none;
    font-size: larger;
}
span{
    margin-right: 25px;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
}


header a {
    color: #fff;
    text-decoration: none;
    margin-right: 1rem;
}


hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 1rem 0;
}
body {
    background: linear-gradient(blue,blueviolet);
   border:1000px;

 }
 .Intro h1{
    text-align: center;
 }

 .dropbtn {
    background:transparent;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
  }
  
  .dropdown {
    position: relative;
    display: inline-block;
  }
  
  .dropdown-content {
    display: none;
    position: absolute;
    background-color:#123456;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
  }
  
  .dropdown-content a {
    color: white;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }
  
  .dropdown:hover .dropdown-content {
    display: block;
  }
  
  .dropdown:hover .dropbtn {
    background-color:#8A2BE2;
  }
  body {
    background-image: url('thumbnail.png');
    background-repeat: no-repeat;
    background-position:center;
    background-size:cover ;
    padding: 0.5cm;
}

footer {
  background-color: #FFD700;
  color: white;
  padding: 10px 0;
  text-align: center;
}