html body {
  margin: 0;
  padding: 0;
  font-family: 'SourceHanSansCN-Regular', sans-serif;
  font-size: 12px;
}

a.black,
a.black :link,
a.black :active {
  text-decoration: none;
  color: black;
}

a:hover{
  color: #e62129;
}

a.btn,
a.btn :active {
  text-decoration: none;
  color: white;
}

.btn:hover {
  cursor: pointer;
}

.active {
  color: #e62129 !important;
}

.header {
  width: 100%;
  height: 64px;
  box-shadow: 0px 0px 10px 0px #7a7a7a;
  margin: 0;
  padding: 0;
  position: fixed;
  top: 0;
  background-color: white;
  z-index: 999;
}

.header .content {
  width: 1200px;
  margin: 0 auto;
  display: flex;
  position: relative;
  justify-content: space-between;
}

.header .content .logo {
  width: 84px;
  height: 42px;
  margin-top: 11px;
}

.header .content .operation {
  width: 359px;
  height: 34px;
  margin-top: 15px;
  display: flex;
  font-size: 17px;
  justify-content: space-between;
}

.header .content .operation .btn-group {
  width: 174px;
  display: flex;
  justify-content: space-between;
  line-height: 34px;
}

.header .content .operation .btn-group .demo-modal {
  width: 115px;
  position: absolute;
  left: 914px;
  top: 58px;
  background: white;
  box-shadow: 0px 6px 11px 2px rgba(122, 122, 122, 0.61);
  display: none;
}

.header .content .operation .btn-group .demo-modal .modal-item {
  height: 36px;
  font-size: 16px;
  line-height: 36px;
  text-align: center;
  border-bottom: 1px solid #cccccc;
}
.header .content .operation .btn-group .demo-modal .modal-item:hover {
  color: #e62129;
}

.header .content .operation .link {
  width: 120px;
  text-align: center;
  color: white;
  font-size: 12px;
  background-color: #e62129;
  line-height: 34px;
}

.container {
  width: 100%;
  position: relative;
  margin-top: 124px;
}

.container .bg {
  height: 734px;
  background-image: url('../image/banner.png');
  background-position: center top;
  background-size: 1920px 734px;
  background-repeat: no-repeat;
}

.container .content {
  width: 1200px;
  margin: 0 auto;
  padding: 0;
}

.container .content .course {
  width: 128px;
  height: 38px;
  text-align: center;
  line-height: 38px;
  color: white;
  background-color: #e62129;
  top: 255px;
  font-size: 13px;
  position: absolute;
}

.container .content .func {
  padding-top: 54px;
}

.container .content .func .title {
  font-size: 26px;
  font-family: 'Source Han Sans CN';
  font-weight: 400;
  color: #2f281e;
}
.container .content .func .desc {
  font-size: 12px;
  font-family: 'Source Han Sans CN';
  font-weight: 400;
  color: #544837;
  line-height: 19px;
}

.container .content .modal {
  width: 1200px;
  margin-top: 52px;
  display: flex;
  justify-content: space-between;
}

.container .content .modal .item {
  width: 255px;
  height: 263px;
  background: #ffffff;
  border-radius: 6px;
}

.container .content .modal .item:hover {
  box-shadow: 0px 10px 16px 2px rgba(196, 196, 196, 0.09);
}

.container .content .modal div .modal-title {
  font-size: 12px;
  font-family: 'Source Han Sans CN';
  font-weight: 400;
  color: #544837;
  line-height: 20px;
  text-align: center;
  margin-top: 20px;
}

.container .content .modal div .modal-btn {
  width: 109px;
  height: 43px;
  margin: 15px auto;
  text-align: center;
  height: 43px;
  font-size: 18px;
  font-family: 'Source Han Sans CN';
  font-weight: 400;
  line-height: 25px;
}

.footer {
  margin-top: 120px;
  margin-bottom: 10px;
}

.upload {
  position: relative;
}

.tool-tip {
  position: absolute;
  width: 135px;
  height: 25px;
  top: 110px;
  line-height: 25px;
  background-color: rgba(0, 0, 0, .7);
  color: white;
  text-align: center;
  display: none;
}

.disabled {
  cursor: not-allowed;
}