SOURCE

 <div class="border-1px">
        嘤嘤嘤
    </div>

        .border-1px {
            position: relative;
            height: 200px;
            width: 200px;
            box-sizing: border-box;
            padding: 20px;
            margin: 100px;
        }
        
        .border-1px:after {
            position: absolute;
            content: '';
            top: -50%;
            bottom: -50%;
            left: -50%;
            right: -50%;
            -webkit-transform: scale(0.5);
            transform: scale(0.5);
            border: 1px solid #d9d9d9;
        }