.margin-top-100{
    margin-top: 100px;
}

.margin-top-40{
    margin-top: 40px;
}
.mainBox{
    background-image: url('../images/xing.png');
    background-position: top center;
    padding-top: 100px;
}

/* 面包屑 */
.crumbs{
    background-color: rgba(255,255,255,0.15);
    padding: 7px 15px;
    font-size: 16px;
    color: #fff;
    letter-spacing: 1px;
}
.crumbs a{
    color: #fff;
}
.crumbs a:hover{
    text-decoration: none;
}
.crumbs a:focus{
    text-decoration: none;
}

/*  */
.blue_title{
    color: #fff;
    font-size: 25px;
    font-weight: bold;
    background-color: #0175a6;
    display: inline-block;
    padding: 10px 20px;
    padding-right: 60px;
    clip-path: polygon(0 0, 80% 0, 100% 100%, 0% 100%);
    letter-spacing: 1px;
    font-style:oblique
}
.choose{
    color: #fff;
    line-height: 30px;
    margin-top: 20px;
    font-size: 14.5px;
    letter-spacing: 1px;
    opacity: 0.9;
}
.choose_bg_box{
    width: 100%;
    height: 160px;
    position: relative;
}
.choose_bg_img_1{
    background-image: url('../images/touch.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}
.choose_bg_img_2{
    background-image: url('../images/smell.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}
.choose_bg_img_3{
    background-image: url('../images/see.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}
.choose_bg_img_4{
    background-image: url('../images/color.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}
.choose_bg_img_5{
    background-image: url('../images/friction.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}
.chooseStep{
    color: #fff;
    font-size: 22px;
    margin-bottom: 5px;
}
.choose_black{
    height: 46px;
    line-height: 46px;
    text-align: center;
    width: 100%;
    background-color: rgba(0,0,0,0.53);
    position: absolute;
    top: 50%;
    margin-top: -23px;
    left: 0;
    z-index: 1;
    color: #fff;
    font-size: 18px;
    letter-spacing: 2px;
}
.benefit_title{
    display: flex;
    align-items: center;
}
.benefit_title span{
    color: #fff;
    font-size: 20px;
    font-weight: bold;
    margin: 0 20px;
    letter-spacing: 1px;
}
.benefit_info{
    font-size: 16px;
    color: #b1b1b1;
    padding-left: 25px;
    margin-top: 35px;
    line-height: 30px;
}