.recommend-mask {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 99;
}
.recommend-mask .recommend-layer {
  box-sizing: border-box;
  width: 720px;
  height: 460px;
  background: #fff;
  border-radius: 10px;
  position: absolute;
  top: 300px;
  left: 50%;
  margin-left: -360px;
  margin-top: -230px;
  box-shadow: 0 0px 76px rgba(0, 0, 0, 0.7);
  z-index: 999;
}
.recommend-mask .recommend-layer .recommend-top {
  padding: 44px 8px 0px 40px;
}
.recommend-mask .recommend-layer .recommend-top h4 {
  font-size: 22px;
  position: relative;
  padding-left: 22px;
  color: #2a2a2a;
}
.recommend-mask .recommend-layer .recommend-top h4:after {
  width: 8px;
  height: 8px;
  background: #EB8A22;
  border-radius: 8px;
  position: absolute;
  content: '\20';
  top: 8px;
  left: 0px;
  z-index: 1;
  box-shadow: 0 2px 10px #e88d31;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course {
  margin-top: 18px;
  overflow-y: auto;
  height: 274px;
  padding: 0 35px 30px 0;
  box-sizing: border-box;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul {
  height: auto;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul li {
  float: left;
  height: 32px;
  line-height: 32px;
  border: 1px solid #dadee0;
  border-radius: 50px;
  margin: 16px 12px 0 0;
  padding: 0 22px;
  color: #585858;
  cursor: pointer;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
  box-sizing: border-box;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul .on {
  border-color: #FF9966;
  background: #ff9966b5;
  color: #000000de;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul::-webkit-scrollbar {
  /*滚动条整体样式*/
  width: 6px;
  /*高宽分别对应横竖滚动条的尺寸*/
  height: 6px;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul::-webkit-scrollbar-thumb {
  /*滚动条里面小方块*/
  border-radius: 3px;
  background: #e6e6e6;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course ul::-webkit-scrollbar-track {
  /*滚动条里面轨道*/
}
.recommend-mask .recommend-layer .recommend-top .recommend-course::-webkit-scrollbar {
  /*滚动条整体样式*/
  width: 6px;
  /*高宽分别对应横竖滚动条的尺寸*/
  height: 6px;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course::-webkit-scrollbar-thumb {
  /*滚动条里面小方块*/
  border-radius: 3px;
  background: #e6e6e6;
}
.recommend-mask .recommend-layer .recommend-top .recommend-course::-webkit-scrollbar-track {
  /*滚动条里面轨道*/
}
.recommend-mask .recommend-layer .recommend-bottom {
  width: 100%;
  padding: 20px 0 40px 0;
}
.recommend-mask .recommend-layer .recommend-bottom .study-btn {
  width: 168px;
  height: 40px;
  text-align: center;
  line-height: 40px;
  color: #fff;
  font-size: 16px;
  letter-spacing: 2px;
  border-radius: 50px;
  box-shadow: 0 2px 10px rgba(181, 185, 188, 0.7);
  margin: 0px auto;
  background: linear-gradient(120deg, #c1c6ca, #b5b9bc);
}
.recommend-mask .recommend-layer .recommend-bottom .on {
  background: #00a8ff;
  box-shadow: 0 2px 10px #FF9966;
  cursor: pointer;
  background: linear-gradient(120deg, #EB8A22, #EB8A22);
}