style.css

.js-loading *,
.js-loading *:before,
.js-loading *:after {
    animation-play-state: paused !important;
}

@keyframes fadeInActivate {
    to {
        opacity: 1;
        pointer-events: auto;
    }
}

html {
    scroll-behavior: smooth;
}

body {
    opacity: 0;
    pointer-events: none;
    animation: fadeInActivate 1.5s ease forwards;
    font-family: Poppins;
    margin: 0;
    overflow-x: hidden;
}

a {
    font-weight: bold;
    font-size: large;
    transition: 0.5s;
    color: firebrick;
}

a:hover {
    opacity: 0.8;
    margin-left: 5px;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

header {
    opacity: 0;
    animation: fadeIn 1.5s ease forwards;
    top: 0;
    left: 0;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
    text-align: center;
    position: fixed;
    z-index: 99999;
    background-color: white;
    font-family: Roboto Mono;
}

.button {
    background-color: black;
    padding: calc(10px + 0.5vw) calc(8px + 0.4vw);
    color: white;
    font-size: calc(8px + 0.4vw);
    opacity: 0.8;
    cursor: pointer;
    transition: 0.5s;
    align-items: center;
    display: grid;
}

.button:hover {
    opacity: 1;
}

.button.selected {
    font-weight: bold;
    opacity: 1;
    pointer-events: none;
}

#intro {
    padding: 80px 40px 40px;
    transition: 0.5s;
    background-color: antiquewhite;
}

#flowchart {
    transition: 0.5s;
    width: 100%;
    height: auto;
}

#flowchart path, #flowchart rect, #flowchart line {
    transition: 0.5s;
}

.hide {
    opacity: 0;
    visibility: hidden;
    transition: 0.5s;
}

footer {
    display: grid;
    background-color: antiquewhite;
    grid-template-columns: auto auto;
    padding: 20px 40px;
    align-items: center;
}

footer p {
    font-size: small;
    font-style: italic;
}

#top {
    color: black;
    transition: 0.5s;
    text-decoration: none;
    text-align: right;
    align-items: center;
}

#top:hover {
    transform: translateY(-5px);
    color: firebrick;
    opacity: 1;
}