<div class="btn-group">
<div class="btn first">这是我的</div><div class="btn">这是我的</div>
</div>
.btn {
padding: 6px 12px;
border: 1px solid #ccc;
display: inline-block;
vertical-align: middle;
float: left;
}
.btn-group .btn + .btn {
margin-left: -1px;
}