html {
  font-size: 14px;
}
@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}
.bd-placeholder-img {
  font-size: 1.125rem;
  text-anchor: middle;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

@media (min-width: 768px) {
  .bd-placeholder-img-lg {
    font-size: 3.5rem;
  }
}
.content{
  width: 100%;
  height: auto;
}
nav h5{
  background: url("../images/logo.png") left center no-repeat;
  background-size: 24px 24px;
  padding-left: 32px;
}
.container {
  max-width: 960px;
}
#loading{background-color:#fff;height:100%;width:100%;position:fixed;margin-top:0px;top:0px;left:0px;bottom:0px;overflow:hidden !important;right:0px;z-index:2000}
.center-container {
  display: flex;
  justify-content: center; /* 水平居中 */
  align-items: center;     /* 垂直居中 */
  min-height: 100vh;       /* 占满整个视口高度 */
}