.cst_bg{
    background: url("../img/custom_pic.jpg");
    background-size: cover;
    position: fixed;
    right: 0;
    top: 0;
    height: 100%;
    width: 35%;
}
.cst_box{
    position: absolute;
    right: 35%;
    top: 140px;
    margin-right: -280px;
    padding: 0 40px 60px 40px;
    width: 560px;
    background-color: #ffffff;
    box-shadow: 0px 4px 20px 0px
    rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    z-index: 1;
}
.cst_d1{
    background: url("../img/custom.png");
    height: 146px;
    width: 376px;
    margin: 120px 0 36px 0;
}
.cst_p{
    font-size: 18px;
    color: #808191;
    line-height: 36px;
    margin-bottom: 100px;
}
.cst_pic{
    background: url("../img/custom_pic.png");
    height: 350px;
    width: 369px;
}
.cst_box_t{
    font-size: 24px;
    font-weight: 600;
    padding: 30px 0 20px 0;
    border-bottom: 1px solid #eee;
    margin-bottom: 30px;
}
.cst_box_d{
    margin-bottom: 30px;
}
.cst_box_left{
    float: left;
    line-height: 40px;
    width: 130px;
    font-size: 16px;
    font-weight: 500;
}
.cst_box_choose{
    width: calc(100% - 130px);
    float: right;
}
.cst_box_choose>a{
    float: left;
    margin-right: 10px;
    margin-bottom: 10px;
    font-size: 14px;
    color: #808191;
    width: 110px;
    line-height: 40px;
    background-color: #fbfbfc;
    border-radius: 4px;
    border: solid 1px #eeeeee;
}
.cst_box_choose>a:nth-child(3n){
    margin-right: 0;
}
.cst_box_choose>a.active{
    color: #3355db;
    border-color: #3355db;
    background: #f4f7ff;
    font-weight: 500;
}
.cst_box_input{
    float: right;
    width: calc(100% - 130px);
    height: 40px;
    background-color: #fbfbfc;
    border-radius: 4px;
    border: solid 1px #eeeeee;
}
.cst_box_input>input{
    height: 100%;
    width: 100%;
    background: none;
    border: none;
    padding: 0 15px;
    font-size: 14px;
}
.cst_btn{
    display: block;
    line-height: 48px;
    color: #fff;
    font-size: 18px;
    background-color: #3355db;
    border-radius: 24px;
    margin: 50px 0 0 0;
}
.cst_box_txt{
    float: right;
    width: calc(100% - 130px);
    height: 100px;
    background-color: #fbfbfc;
    border-radius: 4px;
    border: solid 1px #eeeeee;
}
.cst_box_txt>textarea{
    width: 100%;
    height: 100%;
    border: none;
    font-size: 14px;
    padding: 10px 15px;
    background: none;
}
.cst_btn {
    width: 100%;
    display: block;
    line-height: 48px;
    color: #fff;
    font-size: 18px;
    background-color: #3355db;
    border-radius: 24px;
    margin: 50px 0 0 0;
    cursor: pointer;
}