html,
body {
  position: relative;
  height: 100%;
}

body {
  background: #eee;
  font-size: 14px;
  color: #000;
  margin: 0;
  padding: 0;
}

a {
  text-decoration: none;
  color: #c0c5cf;
}

.about_banner {
  position: relative;
  overflow: hidden;
  height: 100vh;
  background: url("../images/issmartAbout/top_banner.jpg") no-repeat;
  background-size: 100% 100%;
  /* text-align: center; */
}

.index1 {
  width: 100%;
}

.nav_box_wide {
  width: 75rem;
  height: 9.2rem;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  /* bottom: 0; */
  margin: auto;
  z-index: 99;
}

.logo_wide {
  width: 6rem;
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  margin: auto;
}

.nav_btn {
  width: 80%;
  height: 100%;
  position: relative;
  right: 0;
  float: right;
}

.nav_btn ul {
  text-align: center;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  justify-content: flex-end;
}

.nav_btn ul li {
  list-style: none;
  font-size: 20px;
  width: 9rem;
  height: 100%;
  cursor: pointer;
  text-align: right;
  color: #c0c5cf;
  position: relative;
  line-height: 9.2rem;
}

.nav_btn ul li span:hover {
  color: #fff;
}

.index-con {
  width: 75rem;
  height: 100%;
  left: 0;
  right: 0;
  top: 30%;
  margin: auto;
  /* zoom: 1; */
  position: absolute;
  background-color: transparent;
  /* padding-left: 20%; */
}

.index1 .index-con {
  top: 37%;
}

.index1_1 {
  width: 58.75rem;
  font-size: 3.25rem;
  color: #ffffff;
  margin: 0 auto;
}

.index1_2 {
  width: 58.75rem;
  color: #ffffff;
  padding-top: 0;
  font-weight: bold;
  margin: 0 auto;
}

.index1_2 p {
  text-align: left;
  text-indent: 2em;
  font-size: 20px;
  line-height: 35px;
  margin: 0;
  letter-spacing: 2.5px;
}

.about_service {
  width: 100%;
  position: relative;
  overflow: hidden;
  height: 100vh;
  background: url("../images/issmartAbout/index2_banner.png") no-repeat;
  background-size: 100% 100%;
  text-align: center;
}

.index2 {
  width: 100%;
  height: 100%;
}

.index2 .index-con {
  width: 74%;
  /* position: absolute; */
  margin: 0 auto;
  background-color: transparent;
  top: 20%;
}

.index2_1 {
  width: 34.9%;
  margin: 0 auto;
}

.index2_1 img {
  width: 100%;
}

.index2_2 {
  margin-top: 60px;
  width: 100%;
  display: flex;
  justify-content: space-between;
}

.index2_2 img {
  width: 30%;
}

.index2_2 .index2_jiehsao {
  width: 54%;
  text-align: left;
  /* color: #666; */
}

/* .index2_2 .index2_jiehsao .index2_first {
  text-align: left;
} */

.index2_2 .index2_jiehsao span {
  font-size: 20px;
}

.index2_jiehsao p {
  font-size: 16px;
}
.index2 .index2_second {
  margin: 80px 0;
}
.about_prize {
  width: 100%;
  position: relative;
  overflow: hidden;
  height: 100vh;
  background: url("../images/issmartAbout/index4_banner1.png") no-repeat;
  background-size: 100% 100%;
  text-align: center;
}
.about_prize .index4 {
  width: 100%;
  height: 100%;
}
.index4 .index-con {
  width: 80%;
  height: 100%;
  margin: 0 auto;
  top: 12%;
  background-color: transparent;
}
/* .index4_1 {
  width: 15.2%;
  margin: 0 auto;
} */
.index4_jieshao {
  color: #fff;
  font-size: 1.5rem;
}
.index4_2 {
  width: 100%;
  position: absolute;
  width: 100%;
  left: 50%;
  transform: translateX(-50%);
  top: 37%;
}
.index4_3 {
  /* width: 100%; */
  height: 15rem;
  margin: 0 auto;
  text-align: center;
  display: table;
}
.index4_3 li {
  width: 8.4rem;
  height: 5.3rem;
  background: #2B2B2B;
  float: left;
  margin-right: 20px;
  color: #fff;
  padding: 0;
  position: relative;
}
.index4_3 li img {
  position: absolute;
  width: auto;
  height: auto;
  top: -176%;
  left: 50%;
  transform: translateX(-50%);
}
.index4_3 li p {
  display: none;
  font-size: 0.8rem;
  margin-top: 40px;
}

.about_case{
  width: 100%;
  position: relative;
  overflow: hidden;
  height: 100vh;
  background-color: #fff;
}
.index5 {
  width: 100%;
  height: 100%;
}
.index5 .index-con {
  width: 74%;
  height: 100%;
  margin: 0 auto;
  top: 15%;
  background-color: transparent;
  text-align: center;
}
.index5_1 {
  width: 15.2%;
  margin: 0 auto;
}
.index5_1 img {
  width: 100%;
}
.index5_jieshao {
  font-size: 1.5rem;
  /* color: #666; */
  margin: 30px auto 50px;
}
.index5_2 {
  width: 84.5%;
  margin: 0 auto;
}
.index5_2 img {
  width: 100%;
}
.about_contact {
  width: 100%;
  position: relative;
  overflow: hidden;
  height: 80vh;
  background-color: #eae8f6;
  text-align: center;
}
.index6 .index-con {
  width: 74%;
  height: 100%;
  top: 15%;
  left: 0;
  right: 0;
  margin: auto;
  position: absolute;
  background-color: transparent;
}
.index6_1 {
  width: 15.2%;
  margin: 0 auto;
}
.index6_1 img {
  width: 100%;
}
.index6_2, .index6_jieshao {
  width: 84.5%;
  margin: 0 auto;
  /* color: #666; */
}
.index6_2 {
  margin: 50px auto 30px;
}
.index6_2 img {
  width: 100%;
}
.index6_jieshao {
overflow: hidden;
}
.index6_jieshao div {
  width: 33.33333%;
  text-align: left;
  font-size: 1.2rem
}
.index6_jieshao div p {
  margin: 10px 0 0 0;
 font-size: 14px;
 /* color: #666; */
}
.index6_jieshao .email, .index6_jieshao .address {
  float: left;
}
@media only screen and (max-width: 1600px) {
  .index1_1 {
    width: 45.75rem !important;
    font-size: 2.25rem !important;
    color: #ffffff;
  }

  .index1_2 {
    width: 45.75rem !important;
  }

  .index1_2 p {
    text-align: left;
    text-indent: 2em;
    font-size: 16px !important;
    line-height: 28px !important;
    margin: 0;
    letter-spacing: 2.5px;
  }

  .index2_2 .index2_jiehsao span {
    font-size: 18px;
  }

  .index2_jiehsao p {
    font-size: 14px;
  }
  .index2 .index2_second {
    margin: 50px 0;
  }
  .index4_jieshao, .index5_jieshao {
    font-size: 1.2rem;
  }

  .index6_2, .index6_jieshao {
    width: 90%;
  }
  .index6_jieshao div p {
    font-size: 12px;
  }

}

@media screen and (min-width:770px) and (max-width:1920px) {
  .container {
    zoom: .8;
    margin: auto;
  }
}