左图右字各50%布局，右边字怎么水平垂直居中

.parent{
        position: relative;
        .left_img{
            width: 50%;
            float: left;
        }
        .right_content{
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translateY(-50%);
            background-color: #fafafa;
            width: 50%;
            float: left;
            height: 100%;
            .mid_content{
                position: absolute;
                padding: 8rem;
                top: 50%;
                transform: translateY(-50%);
            }
        }
    }