app.css

/* Reset CSS config */

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}

body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

/* Custom CSS */

#navbar {
    position: fixed;
    top:0;
    left:0;
    z-index: 1;
    width: 100%;
    height: 40px;
    background-color: black;
    color: white;
}

#navbar ul {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    list-style-type: none;
    height: 100%;
}

#navbar li {
    padding : 0 5px 0px 5px;
}
#navbar a {
    text-decoration: none;
    color: inherit;
}

#welcome-section {
    padding-top: 40px;
    height: calc(100vh - 40px);
}