.line{
    position: relative;
}

    .line::after {
        content: '';
        display: block;
        height: 2px;
        width: 100%;
        background-color: #efefef;
        position: absolute;
        top: 50%;
        margin-top: -1px;
        z-index: 1;
    }

    .line span {
        background-color: #fff;
        position: relative;
        z-index: 2;
        padding: .4rem .8rem;
    }