.tools_left {
  float: left;
  width: 60%;
  margin-left: 10%;
  padding-top: 10px;
  padding-bottom: 10px;
  font-size: 24px;
  font-family: ºÚÌå;
}

.tools_left a {
  color: #AD2328;
  text-decoration: none;
}

.tools_font {
  position: relative;
  left: 5px;
  top: -10px;
}

.tools_right {
  float: left;
  width: 30%;
  padding-top: 20px;
  padding-bottom: 10px;
}

.tools_right img {
  padding-bottom: 10px;
}

.course_title {
  margin-top: -5px;
}


.bar_div {
  height: 40px;
}


.author_item {
  float: left;
  padding-top: 10px;
  width: 100%;
  background-color: #E2E2E2;
  line-height: 30px;
}


.author_item img {
  padding-bottom: 20px;
}


.author_item hr {
  margin-top: 20px;
}


.author_introduction {
  float: left;
  padding-left: 20px;
  padding-bottom: 10px;
  width: 185px;
  line-height: 18px;
}


.content_div, .detail_div {
  margin-top: 0px;
}


.course_introduction {
  float: left;
  margin-left: 2%;
  padding-bottom: 20px;
  width: 98%;
}