.prevent_header {
  height: 500px;
  background: url(../images/prevent_bg_header.png) no-repeat;
  background-size: 100% 100%;
}
.prevent_header .prevent_header_top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 30px;
}
.prevent_header .prevent_header_top .back a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  color: #fff;
}
.main {
  margin-top: 50px;
}
.main .main_nav {
  display: flex;
  align-items: center;
  gap: 60px;
}
.main .main_nav li {
  font-size: 30px;
  border-bottom: 5px transparent solid;
  padding-bottom: 8px;
}
.main .main_nav li a {
  color: #969696;
}
.main .main_nav li.on {
  border-bottom: 5px #007ddd solid;
}
.main .main_nav li.on a {
  font-weight: 700;
  color: #007ddd;
}
.main .list {
  margin-top: 20px;
}
.main .list li {
  position: relative;
  font-size: 18px;
  padding-left: 30px;
  line-height: 45px;
}
.main .list li::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  width: 7px;
  height: 7px;
  background: #007ddd;
  border-radius: 50%;
  transform: translateY(-50%);
}
.main .list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #333;
}
.main .list li:hover a {
  color: #007ddd;
}