* {
  margin: 0;
  padding: 0;
}

.tab .left > div:nth-child(1) {
  background: none !important;
  color: #000 !important;
}

.tab .left > div:nth-child(2) {
  background: url(../image2/ny_sub_bg.png);
  color: #fff;
}

.course {
  height: 5795px;
  background: url(../image2/course_bj.png) no-repeat center;
  margin-bottom: -82px;
}

.course .positioning {
  width: 20px;
  height: 100%;
  margin: 0 auto;
  position: relative;
}

.course .positioning > div {
  width: 445px;
  transition: transform 0.3s ease;
}

.course .positioning > div:hover {
  transform: scale(1.1);
}

.course .positioning > div h3 {
  color: #a40041;
  font-size: 36px;
  font-weight: 700;
  line-height: 60px;
  width: 480px;
}

.course .positioning > div p {
  font-size: 24px;
  color: #444;
}

.course .positioning > div:nth-child(1) {
  position: absolute;
  left: -112px;
  top: 431px;
}

.course .positioning > div:nth-child(1) h3 {
  font-size: 45px;
  line-height: 70px;
}

.course .positioning > div:nth-child(1) p {
  font-size: 29px;
}

.course .positioning > div:nth-child(2) {
  position: absolute;
  left: -269px;
  top: 678px;
}

.course .positioning > div:nth-child(3) {
  position: absolute;
  left: -158px;
  top: 925px;
}

.course .positioning > div:nth-child(4) {
  position: absolute;
  left: -113px;
  top: 1171px;
}

.course .positioning > div:nth-child(5) {
  position: absolute;
  left: -210px;
  top: 1424px;
}

.course .positioning > div:nth-child(6) {
  position: absolute;
  left: -270px;
  top: 1703px;
}

.course .positioning > div:nth-child(6) {
  position: absolute;
  left: -334px;
  top: 1696px;
}

.course .positioning > div:nth-child(7) {
  position: absolute;
  left: -523px;
  top: 1954px;
}

.course .positioning > div:nth-child(8) {
  position: absolute;
  left: -213px;
  top: 2222px;
}

.course .positioning > div:nth-child(9) {
  position: absolute;
  left: -330px;
  top: 2479px;
}

.course .positioning > div:nth-child(10) {
  position: absolute;
  left: -276px;
  top: 2721px;
}

.course .positioning > div:nth-child(11) {
  position: absolute;
  left: -156px;
  top: 2972px;
}

.course .positioning > div:nth-child(12) {
  position: absolute;
  left: 13px;
  top: 3201px;
}

.course .positioning > div:nth-child(13) {
  position: absolute;
  left: 174px;
  top: 3470px;
}

.course .positioning > div:nth-child(14) {
  position: absolute;
  left: -286px;
  top: 3691px;
}

.course .positioning > div:nth-child(15) {
  position: absolute;
  left: -250px;
  top: 3884px;
  width: 416px;
}

.course .positioning > div:nth-child(16) {
  position: absolute;
  left: -306px;
  top: 4135px;
}

.course .positioning > div:nth-child(17) {
  position: absolute;
  left: -320px;
  top: 4355px;
}

.course .positioning > div:nth-child(18) {
  position: absolute;
  left: -400px;
  top: 4572px;
}

.course .positioning > div:nth-child(19) {
  position: absolute;
  left: -49px;
  top: 4715px;
}

.course .positioning > div:nth-child(19) {
  position: absolute;
  left: -49px;
  top: 4749px;
}

.course .positioning > div:nth-child(20) {
  position: absolute;
  left: -186px;
  top: 4952px;
  width: 510px;
}

.course .positioning > div:nth-child(21) {
  position: absolute;
  left: -389px;
  top: 5185px;
}