nfs/style.css

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;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
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;
}

.hide {
    display: none;
}

.car, .enemy {
    width: 50px;
    height: 100px;
    background: transparent url('./image/mycar.png') center / cover no-repeat;
    position: absolute;
    left: 125px;
    bottom: 10px;
}

.gameArea {
    position: relative;
    width: 300px;
    height: 100%;
    margin: auto;
    background: gray;
    overflow: hidden;
}

.line {
    width: 10px;
    height: 50px;
    left: 145px;
    position: absolute;
    background: #fff;
}

.startTitle {
    margin-top: 50%;
    text-align: center;
    font-size: 1.5rem;
    z-index: 2;
}

.start {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    margin: 0;
    padding: 2rem 0;
    z-index: 200;
    color: #fff;
    font-size: 1.5rem;
    background: black;
    font-family: sans-serif;
    font-weight: 700;
    text-align: center;
}

.score {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    margin: 0;
    padding: 1rem 0;
    z-index: 200;
    font-size: 1.5rem;
    background: black;
    color: skyblue;
    font-family: sans-serif;
    font-weight: 500;
    text-align: center;
}