.download-list li {
    float: left;
    width: 50%;
    padding: 25px 20px;
    border-bottom: 1px solid #E5E5E5;
    position: relative;
    text-align: center;
}

.download-list li +li::after {
    content: "";
    display: inline-block;
    border-right: 1px dotted #A5A5A5;
    position: absolute;
    left: 0;
    height: 75%;
    top: 15px;
}

.download-list li:nth-child(2n+1):after {
    opacity: 0;
}

.download-list li .pic-box {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    line-height: 110px;
    font-size: 50px;
    margin: 0 0 15px;
    border: 1px solid #E5E5E5;
    color: #757575;
    display: inline-block;
    vertical-align: middle;
}

.download-list li .txt {
    width: calc(100% - 110px);
    display: inline-block;
    padding-left: 10px;
    box-sizing: border-box;
    vertical-align: middle;
    color: #000000;
    text-align: left;
    font-size: 17px;
    line-height: 24px;
}

.download-list li:hover .pic-box {
    color: #AB1032;
    border-color: #AB1032;
}

.download-list li:hover .txt {
    color: #757575;
}

@media screen and (max-width:600px) {
    .download-list li {
        width: 100%;
        padding: 10px 0;
    }
    .download-list li +li::after {
        opacity: 0;
    }
    .download-list li .pic-box {
        margin: 0;
    }
}