* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
a {
  text-decoration: none;
}
li {
  list-style: none;
}
body {
  max-width: 540px;
  margin: 0 auto;
}
header {
  padding-top: 2%;
}
header .logobox {
  padding-left: 2%;
}
header .logobox img {
  width: 115px;
  height: 35px;
}
.menu {
  margin: 2% 0;
  overflow-x: auto;
  white-space: nowrap;
}
.menu ul {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
}
.menu ul li {
  flex: 0 0 auto;
  width: 20%;
}
.menu ul li a {
  color: #000;
  font-size: 14px;
  display: block;
  text-align: center;
}
.menu ul li a:hover {
  color: #1987ff;
}
.contentbox p img {
  width: 100%;
}
.color {
  color: #1987ff !important;
}
.kefu {
  position: fixed;
  right: 2%;
  top: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #2196f3;
  padding: 8px 6px;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s;
}
.kefu:hover {
  background: #0052d9;
}
.kefu i,
.kefu span {
  padding: 2px;
  color: white;
}
.kefu span {
  font-size: 12px;
}
.backtopbox {
  position: fixed;
  bottom: 10%;
  right: 5%;
  border-radius: 50px;
}
.backtopbox ul li a {
  padding: 8px;
  background: #575151;
  color: #fff;
  border-radius: 50px;
  font-size: 15px;
  display: none;
}
footer {
  text-align: center;
  margin: 15px 0;
}
footer p {
  font-size: 14px;
  color: #333333;
  padding: 5px 0;
}
footer p a {
  font-size: 14px;
  color: #333333;
}
footer p a:hover {
  color: #2196f3;
}