.navbar {
    overflow: hidden;
    background-color: #333;
}

.navbar a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 20px;
    text-decoration: none;
}

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

.navbar a.active {
    background-color: #4CAF50;
    color: white;
}

.navbar a:not(:first-child) {
    display: none;
}

.navbar a.icon {
    display: none;
    float: right;
}

@media screen and (max-width: 600px) {
    .navbar a:not(:first-child) {
        display: none;
    }
    .navbar a.icon {
        float: right;
        display: block;
    }
}

.hamburger {
    display: block;
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 5px auto;
    transition: all 0.3s ease-in-out;
}

.change .hamburger:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.change .hamburger:nth-child(2) {
    opacity: 0;
}

.change .hamburger:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}