.fieldset {
border: 1px solid #ddd;
margin-top: 1em;
width: 500px;
}
.fieldset h1 {
font-size: 12px;
text-align: center;
}
.fieldset h1 span {
display: inline;
border: 1px solid #ddd;
background: #fff;
padding: 5px 10px;
position: relative;
top: -1.3em;
}
<div class="fieldset">
<h1><span>Title</span></h1>
<p>Content</p>
</div>