.banner{width: 100%;}
.banner img{width: 100%;}
.yanjiu{width: 100%;padding-top: 50px;}
.yanjiu h1{ text-align: center;color: #020202; font-weight: 500; font-size: 28px;letter-spacing:2px;}
.yanjiu ul{width: 1100px;margin: 0 auto;margin-top: 50px; margin-bottom:50px;}
.yanjiu ul li{background: #F2F2F2; position: relative;width: 100%; margin-bottom: 50px;}

.yanjiu ul li .li_left{width: 400px;}
.yanjiu ul li .li_left img{width: 100%;}
.yanjiu ul li .li_right{background: #43C7FF; color: #fff;width: 750px; position: absolute; right:0;  height: 90%; top: 5%; padding:20px 30px;display:flex; justify-content:space-between;flex-direction:column;}
.yanjiu ul li .li_right dl{font-size: 24px;}
.yanjiu ul li .li_right dd{padding-top: 5px;font-size: 14px; line-height: 22px;}
.yanjiu ul li .li_right dt{font-size: 14px; line-height: 24px;}
.yanjiu ul li .li_right .li_bg{ position: absolute; right: 0; bottom: 0 ;}

.yanjiu ul li.two,.yanjiu ul li.four{justify-content: flex-end;display: flex;}
.yanjiu ul li.two .li_left,.yanjiu ul li.four .li_left{width: 400px;}
.yanjiu ul li.two .li_right,.yanjiu ul li.four .li_right{background: #657DFC; color: #fff;width: 750px; position: absolute; left:0;  height: 90%; top: 5%; padding:20px 30px;display:flex; justify-content:space-between;flex-direction:column;}
.yanjiu ul li.two .li_right dl,.yanjiu ul li.four .li_right dl{font-size: 24px;}
.yanjiu ul li.two .li_right dd,.yanjiu ul li.four .li_right dd{padding-top: 5px;font-size: 14px; line-height: 22px;}
.yanjiu ul li.two .li_right dt,.yanjiu ul li.four .li_right dt{font-size: 14px; line-height: 24px;}
.yanjiu ul li.two .li_right .li_bg,.yanjiu ul li.four .li_right .li_bg{ position: absolute; right: 0; bottom: 0 ;}



.yanjiu ul li.three .li_right{background: #598FC1;}
.yanjiu ul li.four .li_right{background: #62B66B;}
.yanjiu ul li.five .li_right{background: #7F89AC;}