html {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Microsoft YaHei",Arial,Helvetica,sans-serif,"SimSun";
  min-width: 500px;
  width: 100%;
  overflow: auto;
}

* {
  box-sizing: border-box;
}

#container {
  padding: 0;
  padding-bottom: 100px;
  margin: 0 auto;
  max-width: 1200px;
  min-height: 100%;
}

#container-inside {
  padding-bottom: 50px;
}

.div_banner {
  width: 100%;
  height: auto;
  padding: 0;
  display: -webkit-flex;
  display: flex;
  align-items: center;
}

.btn_shift {
  width: 40px;
  height: 80px;
  margin: 0;
  padding: 0;
  border: none;
  display: inline-block;
  text-align: center;
  align-items: center;
  text-decoration: none;
  font-size: 35px;
  visibility: hidden;
  background-color: #111;
  opacity: 0.7;
  -webkit-transition-duration: 0.5s;
/* Safari */
  transition-duration: 0.5s;
  cursor: pointer;
  z-index: 8999;
}

.btn_shift:hover {
  background-color: #efefef;
  opacity: 0.7;
}

.img_banner {
  width: 100%;
  height: 40%;
  max-height: 500px;
  flex: 1;
  margin-left: -40px;
  margin-right: -40px;
  cursor: pointer;
}

@media screen and (max-width: 1200px) {
  body {
      padding: 0;
  }
}