.box{
            position: relative;
            width:500px;
            height: auto;
            padding: 10px;
            border:solid 1px red;
            display: flex;
            justify-content: center;
        }
        .box::before{
            position: absolute;
            content: '';
            width: 100%;
            height: 2px;
            background-color: black;
            top: 0;
            bottom: 0;
            left: 0;
            right: 0;
            margin: auto;
            z-index: 0;
        }
        .box h1{
            position: relative;
            z-index: 1;
            background-color: #fff;
            padding: 0 10px;
        }

    <div class="box">
        <h1>Selamlar Naber</h1>
    </div>