.icon-eletronic {
    display: inline-block;
    width: 1.2em;
    height: 1.2em; /* matching typical font-size */
    background: url('/img/icon-eletronic.png') no-repeat 0px -2px;
    background-size: contain;
    vertical-align: middle; /* align with text */
    margin-right: -1px;
    filter: invert(100%); /* 将图标反色：黑变白，白变黑 */
    /* ensure no pseudo content interferes */
}