styles.css

@import url('https://fonts.googleapis.com/css?family=Poppins');

:root {
    --navbar-bg-color: #262626;
    --navbar-text-color: #fff;
    --navbar-active-color: #2196f3;

    --banner-text-color: #fff;
    --banner-bg-color: #262626;

    --logo-text-color: #fff;

    --content-text-color: #262626;

    --footer-bg-color: #262626;
    --footer-text-color: #262626;
}

* {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
}

.container {
    position: relative;
}

.banner {
    position: relative;
    width: 100%;
    height: 100vh;
    background-image: url(banner.jpg);
    background-size: cover;
}

.banner::before {
    width: 100%;
    height: 100vh;
    content: attr(data-banner-text);
    background: rgba(0, 0, 0, .3);
    color: var(--banner-text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5em;
    text-shadow: 0 0 5px rgba(0, 0, 0, .8);
}

.navbar {
    position: sticky;
    top: 0;
    width: calc(100% - 40px);
    padding: 0 20px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    background: var(--navbar-bg-color);
}

.logo {
    text-transform: uppercase;
    text-decoration: none;
    color: var(--logo-text-color);
    font-weight: bold;
    font-size: 20px;
}

.navbar ul {
    display: flex;
    justify-content: flex-end;
    flex-grow: 1;
    height: 100%;
}

.navbar ul li {
    height: 100%;
    list-style: none;
    padding: 0 10px;
    line-height: 80px;
}

.navbar ul li a {
    text-decoration: none;
    color: var(--navbar-text-color);
}

.active,
.navbar ul li:hover {
    background: var(--navbar-active-color);
    color: var(--navbar-text-color);
}

.content {
    padding: 50px;
    box-sizing: border-box;
}

.footer {
    width: 100%;
    padding: 10px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    border-top: 1px solid var(--footer-bg-color);
}

.footer a {
    text-decoration: none;
    font-weight: bold;
    color: var(--footer-text-color);
}

.footer a:hover {
    text-decoration: underline;
    cursor: pointer;
}