.section3{
    margin-top: 50px;
}
.section3 .section_title,
.section3 .section_description,
.section3 .section_content{
    z-index: 2;
}

.section3 .section_img{
    position: absolute;
    top: 0;
    left: 0;
    background-image: url("../../../media/wall.jpg");
    height: 100%;
    width: 100%;
    opacity: 65%;
    z-index: 1;
}

.section3 .section_content a{
    display: block;
    background-color: rgb(60, 60, 60);
    text-decoration: none;
    color:whitesmoke;
    width: 80%;
    text-align: center;
    padding: 10px 0px;
    margin-left: 10%;
    font-size: 20px;
    isolation: isolate; /* 新增 */
    border-radius: 30px !important;
    -webkit-border-radius:30px !important;
    transition: all .35s;
    box-shadow:0  0  0  2px  black;
    margin-bottom: 20px;
}
.section3 .section_content a:hover{
    background-color: white;
    color:black;
}

.section3 .row >div{
    padding:25px;
}




.mypaper_use{
    border-top: 1px solid rgb(74, 74, 74);
    border-bottom: 1px solid rgb(74, 74, 74);
    padding: 5px 5px;
    padding-bottom: 3px;
}
.mypaper_use >div{
    display: inline-block;
}

.mypaper_use >div:nth-child(n+2){
    position: relative;
    padding-left: 15px;
    padding-right: 5px;
    margin-bottom: 2px;
    border-radius: 11px;
    border: 2px solid;

}
.mypaper_use >div:nth-child(n+2)::after{
    content: "";
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 3px;
    width: 10px;
    height: 10px;
    border-radius: 5px;
}

.mypaper_description p{
    padding: 10px;
    margin-bottom: 5px;
}