.text
{
border: 1px solid #00f;
height: 200px;
position: relative;
width: 200px;
}
.text:after
{
position:absolute;
top: 10%;
height: 80%;
content: "";
width: 99%;
left: -3px;
border-left: 5px solid #fff;
border-right: 5px solid #fff;
}
.text:before
{
position:absolute;
left: 10%;
height: 99%;
content: " ";
width: 80%;
top: -3px;
border-top: 5px solid #fff;
border-bottom: 5px solid #fff;
}
<div class="text">test test gfgfgf gfg f</div>
Это мой вариант.