* {
    margin: 0px;
    padding: 0px;
}
html {
    margin: 0px;
    padding: 0;
    height: 100%;
}
body {
    margin: 0;
    padding: 0;
    background-color: black;
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('../assets/san-francisco.jpg');
    background-position: 0 center;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-origin: border-box;
    height: 100%;
    font-family: 'Raleway', sans-serif;
    color: white;
}
h2, h3 {
    text-align: center;
}
h1 {
    font-size: 80px;
}
h2 {
    font-size: 60px;
}
h3 {
    font-size: 30px;
}
h4 {
    font-size: 24px;
}
header {
    position: absolute;
    z-index: 1;
    left: 0px;
    right: 0px;
    margin-left: auto;
    margin-right: auto;
    height: 80px;
}
main {
    position: absolute;
    z-index: 0;
    left: 0px;
    right: 0px;
    top: 80px;
    bottom: 30px;
    margin-left: auto;
    margin-right: auto;
    scroll-snap-type: y mandatory;
    overflow-y: scroll;
    padding: 0;
}
main section {
    height: 100%;
    width: 100%;
    overflow-y: scroll;
    margin-left: auto;
    margin-right: auto;
    scroll-snap-align: start;
}
.inactive-section * {
    transition-duration: 1s;
    transition-property: opacity;
    opacity: 0;
}
.active-section * {
    transition-duration: 1.2s;
    transition-property: opacity;
    opacity: 1;
}
footer {
    position: absolute;
    z-index: 1;
    left: 0;
    right: 0;
    bottom: 0;
    height: 30px;
}
footer p {
    text-align: center;
}
@media only screen 
and (max-width: 600px) 
{
    header {
        display: none;
    } 
    main {
        top: 0px;
    }
    main section {
        padding: 24px;
        overflow-x: hidden;
        width: 100% !important;
    }
}