社会喵

<hr class="hr">

.hr {
    color: #000;
    border: 0;
    font-size: 12px;
    padding: 10px 0;
    position: relative;
}
.hr::before {
    content: "分隔线";
    position: absolute;
    padding: 0 10px;
    line-height: 1px;
    border: solid red;
    border-width: 0 100vw;
    white-space: nowrap;
    left: 50%;
    transform: translateX(-50%);
}