* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
}

header {
    background-image: url('../img/Zoo\ Banner.jpg'); 
    background-position: 25% -20%;
    background-attachment: fixed;
}

/* Centers vertically and horizontally */
.center {
    margin: auto;
    width: 50%;
    text-align: center;
    justify-content: center;
    align-items: center;
}

.main-nav .navbar-brand {
    padding: 0;
}

.main-nav .navbar-nav .nav-item {
    position: relative;
}

.main-nav .navbar-nav .nav-item .nav-link {
    position: relative;
    text-align: center;
    font-size: 15px;
    text-transform: uppercase;
    font-weight: 600;
    color: #000;
    padding-left: 20px;
    padding-right: 20px;
    text-shadow: -1px -1px 0 black;
}

.main-nav .navbar-nav .nav-item .nav-link span i {
    font-size: 11px;
}

/* -------------------------------------------------------- */
/* Colors the page nav header you are on */
.main-nav .navbar-nav .nav-item.active .nav-link {
    color: #2e7eed;
}

.main-nav .navbar-nav .nav-item.active .nav-link:before {
    content: '';
    background: #2e7eed;
    width: 60%;
    height: 2px;
    position: absolute;
    top: 0;
    left: 20%;
}

/* -------------------------------------------------------- */

.main-nav .dropdown {
    position: absolute;
}

.main-nav .dropdown .dropdown-menu {
    padding: 0;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    display: none;
    margin-top: 0;
}

.main-nav .dropdown .dropdown-menu.show {
    display: block;
}

.main-nav .dropdown .dropdown-menu .dropdown-item {
    font-size: 13px;
    padding: 3px 22px;
    transition: .3s ease;
}

.main-nav .dropdown .dropdown-menu .dropdown-item.active,
.main-nav .dropdown .dropdown-menu .dropdown-item.focus,
.main-nav .dropdown .dropdown-menu .dropdown-item:focus,
.main-nav .dropdown .dropdown-menu .dropdown-item:hover {
    background-color: transparent;
    color: #2e7eed;
}

.main-nav .dropdown .dropdown-menu li:first-child {
    margin-top: 10px;
}

.main-nav .dropdown .dropdown-menu li:last-child {
    margin-bottom: 10px;
}

@media (min-width: 992px) {
    .main-nav .dropdown .dropdown-menu {
        position: absolute;
        display: block;
        visibility: hidden;
        opacity: 0;
        -webkit-transform: translateY(10px);
        transform: translateY(10px);
        transition: visibility 0.2s, opacity 0.2s, -webkit-transform 500ms cubic-bezier(0.43, 0.26, 0.11, 0.99);
        transition: visibility 0.2s, opacity 0.2s, transform 500ms cubic-bezier(0.43, 0.26, 0.11, 0.99);
        transition: visibility 0.2s, opacity 0.2s, transform 500ms cubic-bezier(0.43, 0.26, 0.11, 0.99), -webkit-transform 500ms cubic-bezier(0.43, 0.26, 0.11, 0.99);
    }

    .main-nav .dropdown:hover>.dropdown-menu {
        opacity: 1;
        visibility: visible;
        color: #777;
        -webkit-transform: translateY(0px);
        transform: translateY(0px);
    }
}