header {
    width: 1080px;
    height: 300px;
    z-index: 999;
}

nav {
    background-color: #ffffff;
    width: 100%;
    height: 75px;
    text-align: center;
    top: 0;
    left: 0;
    z-index: 999;
}

nav>ul {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    list-style: none;
}

nav>ul>li {
    width: 25%;
    float: left;
    margin: auto;
    color: #ffffff;
    font-size: 20px;
    font-weight: bold;
    position: relative;
}

.home_nav:hover {
    background: #C8C8C8;
}

.python_nav:hover {
    background: #306998;
}

.extra_nav:hover {
    background: #C51A4A;
}

.project_nav:hover {
    background: #00878F;
}

nav>ul>li>a {
    color: black;
    text-decoration: none;
    display: block;
    padding: 24px 0;
}

nav>ul>li>ul.dropdown {
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    visibility: hidden;
    opacity: 0;
}

nav>ul>.python_nav>.dropdown {
    background: #ffde57;
    height: 50px;
}

nav>ul>.extra_nav>.dropdown {
    background: #6CC04A;
    height: 50px;
}

nav>ul>.project_nav>.dropdown {
    background: #E47128;
    height: 50px;
}

nav>ul>li>ul.dropdown li {
    font-size: 15px;
    width: 100%;
    height: 50px;
}

nav>ul>li>ul.dropdown li>a {
    text-decoration: none;
    color: black;
    display: block;
    padding: 15px 0;
}

nav>ul>.python_nav>ul.dropdown li>a:hover {
    color: #306998;
}

nav>ul>.extra_nav>ul.dropdown li>a:hover {
    color: #C51A4A;
}

nav>ul>.project_nav>ul.dropdown li>a:hover {
    color: #00878F;
}

nav>ul>li:hover>ul.dropdown {
    visibility: visible;
    opacity: 1;
}

/* Mobile Version */

/*
@media only screen and (max-width: 1080px) {

nav>ul>li:hover>ul.dropdown{
  visibility: hidden;
  opacity: 1;
}

}
*/