.navigation_bar {
    overflow: hidden;
    background-color: #f5f5f5;
}

.navigation_bar a {
    float: left;
    color: #020202;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

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

.navigation_bar a.active_a {
    background-color: #77FA4D;
    color: black;
}
.navigation_bar a.active_b {
    background-color: #fffe55;
    color: black;
}
.navigation_bar a.active_c {
    background-color: #E73324;
    color: white;
}
.navigation_bar a.active_d {
    background-color: #ea38ce;
    color: white;
}
.navigation_bar a.active_e {
    background-color: #5AA2F8;
    color: white;
}