.last-common-box {
    border-bottom: 1px dotted  #D2D2D2;
    line-height: 36px;
}

.last-common-title {
    height: 36px;
    line-height: 36px;
    float: left;
    margin: 0 15px 0 0;
}
.last-common-warpper {
    position: relative;
    margin: 0 4px 0 0;
    display: inline-block;
}
.info-img {
    position: absolute;
    width: 15px;
    top: -8px;
    left: 50%;
    margin-left: -7px;
    cursor: pointer;
}