我想把我的7个div放在中心,我不知道该怎么做.任何的想法?我不想单独更改所有元素的边距,正如您在图片上看到的那样div与我的按钮相比没有居中,并且存在12列引导问题

<style type="text/css">
.properbut{
height: 180px;
display: block;
margin-left: auto;
margin-right: auto;
display: table-cell;
vertical-align: middle;
}
.fonts{
font-family:Georgia,serif;
color:#4E443C;
font-variant: small-caps;
text-transform: none;
font-weight: 100;
font-size: 30px
}
</style>
<div class="container">
<br><br><br><br>
<div class="jumbotron">
<br><br><br><br><br><br>
<div class="row">
<div class ="col-md-2">
</div>
<div class ="col-md-1 ">
<img src="<?php echo asset_url();?>media/img/kalendarz/pon.png" style="height: 60px;">
</div>
<div class ="col-md-1 ">
<img src="<?php echo asset_url();?>media/img/kalendarz/wto.png" style="height: 60px">
</div>
<div class ="col-md-1 ">
<img src="<?php echo asset_url();?>media/img/kalendarz/sro.png" style="height: 60px">
</div>
<div class ="col-md-1 ">
<img …Run Code Online (Sandbox Code Playgroud)