body {
    padding-top: 50px;
    background-color: black;
}

.text-white-color {
    color: white
}

.image-margin {
    margin-top: 5%;
}

.navigation-bar {
    background-color: black;
}

ul {
    list-style: none;
}

li {
    float: left;
}

li a {
    padding: 10px;
    color: grey;
    font-size: 20px;
}

li a:hover {
    color: red;
}