.background {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}
.bannerBg {
  width: 100%;
  height: 100%;
  z-index: -1;
}

/* 内容 */
.securityChild {
  background: url('/static/img/security/luanqianse.png') no-repeat;
  margin-top: 60px;
}

.ml400 {
 /*  margin-left: 400px; */
  display: flex;
  margin: 0 auto;
  width: 1200px;
}


.securityChild-side>ul>li {
  width: 130px;
  height: 28px;
  font-size: 20px;
  color: #333333;
  font-weight: 500;
  line-height: 21px;
  margin: 0px 0px 21px 0px;
}

.securityChild-side>ul>li>a {
  color: #333333;
}

.active {
  color: #5298EB;
}

.actives {
  height: 28px;
  border-right: 2px solid #5298EB;
}

.active-color {
  color: #5298EB !important;
}

/* hover */
.securityChild-side>ul>li:hover {
  height: 28px;
  border-right: 2px solid #5298EB;
}

.securityChild-side>ul>li>a:hover {
  color: #5298EB;
}

.securityChilds {
  border-left: 1px solid #E5E5E5;
  padding-left: 60px;
  display: flex;
  flex-direction: column;
}

.securityChilds-title {
  height: 26px;
  font-size: 19px;
  color: #333333;
  letter-spacing: 0;
  font-weight: 500;
  margin-bottom: 25px;
  padding-bottom: 11px;
  border-bottom: 1px solid #f5f7fa;
}

.securityChilds-resem {
  width: 880px;
  font-size: 18px;
  color: #333333;
  line-height: 32px;
  font-weight: 400;
}
.securityChilds-img {
  margin: 48px auto 0px auto;
}

.mat29 {
  /* width: 960px;
  margin: auto;*/
  display: contents;
}

.mar130 {
  margin: 40px 0px 0px 130px;
}
/* 设备最大宽度1440px */
@media screen and (min-width: 1025px) {
.ml400 {
    width: 1400px;
}
.mobile{
  display:none;
}
.securityChild-side>ul>li {
    width: 104px;
}
.securityChilds-resem {
    width: auto;
    font-size: 16px;
    line-height: 26px;
}
.securityChilds-img {
    width:600px;
    margin: 24px auto 0px auto;
}
}
/* 设备最大宽度1024px */
@media screen and (max-width: 1024px) {
.ml400 {
    width: 960px;
}
.mobile{
  display:none;
}
.securityChild-side>ul>li {
    width: 96px;
    margin: 0px 0px 16px 0px;
}
.securityChilds {
   padding-left: 31px;
}
.securityChilds-resem {
    width: 798px;
    font-size: 16px;
    line-height: 26px;
}
.securityChilds-img {
    width: 392px;
    margin: 24px auto 0px auto;
}
}
/* 设备最大宽度750px */
@media screen and (max-width: 750px) {
.bannerBg {
    height: 220px;
}
.securityChild {
    background: none;
    margin-top: 0px;
}
.ml400 {
   display:none;
}
.mobile{
   width: 344px;
   margin:auto;
   display:block;
}
.securityChild-side{
  display:none;
}
.securityChilds {
    border-left: none;
    padding-left: 0px;
}
.securityChilds-title{
   margin-bottom: 0px
}
.securityChilds-resem {
    width: 344px;
    font-size: 14px;
    line-height: 24px;
    margin-top:8px;
}
.securityChilds-img {
  margin: 16px auto 0px 30px;
  width: 284px;
}
}