*{
  padding: 0;
  margin: 0;
  font-size: 16px;
  box-sizing: border-box;
  color: #333;
}
body{
  width: 100vw;
  height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
}
a{
  cursor: pointer;
  color: #333;
  text-decoration: none;
}
a:hover{
  text-decoration: underline;
  color: #409EFF;
}
a.active{
  text-decoration: underline;
  color: #409EFF;
}
.head{
  width: 100%;
  background-color: #fafafa;
  box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
}
.head div{
  width: 1000px;
  margin: auto;
  line-height: 50px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo{
  width: 1000px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 0;
}
.logo img{
  width: 300px;
  height: auto;
}
.menu{
  width: 1000px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer{
  width: 1000px;
  margin: auto;
  padding: 40px 0;
  text-align: center;
}