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 {
  background-color: black;
}

.main {
  position: relative;
  width: 100%;
  margin: 0 auto;
}

.img {
  display: block;
  width: 100%;
}

.img-m {
  display: none;
}
.btn1 {
  position: absolute;
  width: 34.8%;
  height: 7%;
  top: 63.2%;
  left: 33.1%;
}
.btn2 {
  position: absolute;
  width: 34.8%;
  height: 7%;
  top: 71%;
  left: 33.1%;
}

.btn3 {
  position: absolute;
  width: 34.8%;
  height: 7%;
  top: 79%;
  left: 33.1%;
}
.btn4 {
  position: absolute;
  width: 44.8%;
  height: 5.4%;
  top: 93.9%;
  left: 26.6%;
}

@media screen and (max-width: 768px) {
  .img {
    display: none;
    width: 100%;
  }

  .img-m {
    display: block;
    width: 100%;
  }

  .btn1 {
    position: absolute;
    width: 89.8%;
    height: 6.3%;
    top: 62.8%;
    left: 5.1%;
  }
  .btn2 {
    position: absolute;
    width: 89.8%;
    height: 6.3%;
    top: 69.9%;
    left: 5.1%;
  }

  .btn3 {
    position: absolute;
    width: 89.8%;
    height: 6.3%;
    top: 76.8%;
    left: 5.1%;
  }
  .btn4 {
    position: absolute;
    width: 100%;
    height: 8.5%;
    top: 90.9%;
    left: 0%;
  }
}