* {
  box-sizing: border-box;
}

body {
  font-family: Arial, Helvetica, sans-serif;
}


/* Slika */
img {
max-width: 100%;
display: block;
height: auto;
  }

/* Youtub */
iframe {
max-width: 100%;
display: block;
height: auto;
  }

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
   }

li {
  float: left;
}

li a, .dropbtn {
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn {
  background-color: red;
}

li.dropdown {
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1;}

.dropdown:hover .dropdown-content {
  display: block;
}

.header img {
  float: center;
  width: 100%;
  height: 100%;
}

.footer img {
  float: center;
  width: 100%;
  height: 100%;
}

article {
  float: center;
   width: 100%;
  background-color: FFFFFF;
  height:1000px;
}

.button {
  background-color: #219ee4;
  border: none;
  color: white;
  padding: 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 4px 2px;
  cursor: pointer;
  }

.button {border-radius: 12px;}