SOURCE

<div class="main">默认</div>

.main {
    font-size: 30px;
    outline: solid 1px #aaa;
    /* display: flex; */
    /* align-items: center; */
    resize: both;
    width: 200px;
}

.main::before {
    margin-right: 10px;
    content: '';
    display: inline-block;
    width: 16px;
    height: 1ex;
    background: #aaa;
    border-radius: 50%;
    vertical-align: 3px;
}