@charset "utf-8";

html, body {
  height: 100%;
  width: 100%;
  margin: 0;
  overflow: hidden;
}

img {
  border: 0 none;
  margin: 0;
  vertical-align: middle;
}

.top_main_buttons ul {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow: hidden;
}

.top_main_buttons li {
  box-sizing: border-box;
  width: calc(50% - 3px);
  margin: 6px 0 0;
  padding: 0;
  float: left;
}
.top_main_buttons li:nth-child(2n-1) {
  margin-right: 6px;
}
.top_main_buttons li:first-child,
.top_main_buttons li:nth-child(2) {
  margin-top: 0;
}

.top_main_buttons li a {
  display: block;
}

.top_main_buttons li img {
  width: 100%;
}