html, body, div, span, applet, object, embed, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, xmp, pre,
a, abbr, abbr[title], 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, hr,
table, td, th,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend, input, button, textarea, select, optgroup,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, figcaption, figure,
footer, header, hgroup, menu, nav, output, ruby,
section, summary, time, mark, audio, video {
    padding: 0;
    margin: 0;
    vertical-align: baseline;

    background: transparent;

    border: 0;

    font: inherit;
    outline: 0;
}

img {
    display: block;
    width: 100%;
    height: auto;
}

.background-image {
    display: block;
    width: 100%;
    height: 0;
    padding-bottom: 50%;
    background-size: cover;
    background-position: 50%;
    background-repeat: no-repeat;
}