/* Main Navigation */
nav {
    background: #444;
    width: 100%;
}

nav ul {
    padding: 0;
    margin: 0;
}

nav ul li {
    position: relative;
    display: inline-block;
    list-style-type: none;
    margin: 0;
    padding: 10px 0; 
    font-size: 12;
}
    nav ul li:hover {
        background: #008B8B;        /*old03ADDF; */ 
    }

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 10px;
    font-size 16px;
}
    nav ul li a:hover {
        color: #fff;
        text-decoration: none;
    }

/* Sub Menu */
nav ul li.parent ul.child {
    display: none; /* Hide Sub Menu */
}
nav ul li.parent:hover ul.child {
    display: block; /* Show Sub Menu on Hover */
    position: absolute;
    top: 40px;
    background: #008B8B;           /* old 03ADDF;*/
}

nav ul li.parent ul.child li {
    width: 9em;
    padding: 0;
}
nav ul li.parent ul.child li:hover {
    background: #008B8B                /* old 008FBA;*/
}
nav ul li.parent ul.child li a {
    display: block;
}   
    
 


/*css for button use next*/


a {
  text-decoration: none;
  display: inline-block;
  padding: 8px 16px;
}

a:hover {
  background-color: #ddd;
  color: black;
}

.previous {
  background-color: #f1f1f1;
  color: black;
}

.next {
  background-color: #4CAF50;
  color: white;
}

.round {
  border-radius: 50%