.thumbnail {
display: block;
padding: 4px;
margin-bottom: 20px;
line-height: 1.42857143;
background-color: #fff;
border: 1px solid #ddd;
border-radius: 4px;
-webkit-transition: all .2s ease-in-out;
transition: all .2s ease-in-out;
}
.thumbnail > img,
.thumbnail a > img {
margin-right: auto;
margin-left: auto;
}
a.thumbnail:hover,
a.thumbnail:focus,
a.thumbnail.active {
border-color: #428bca;
}
.thumbnail .caption {
padding: 9px;
color: #333;
}

<div class="container">
<div class="row">
<div class="col-md-3">
<a herf="#" class="thumbnail">
<img src="img/1.jpg" style="height:180px;width:100%;display: block">
</a>
</div>
<div class="col-md-3">
<a herf="#" class="thumbnail">
<img src="img/2.jpg" style="height:180px;width:100%;display: block">
</a>
</div>
<div class="col-md-3">
<a herf="#" class="thumbnail">
<img src="img/3.jpg" style="height:180px;width:100%;display: block">
</a>
</div>
<div class="col-md-3">
<a herf="#" class="thumbnail" >
<img src="img/4.jpg" style="height:180px;width:100%;display: block">
</a>
</div>
</div>
</div>

<div class="container">
<div class="row">
<div class="col-md-3">
<a href="#" class="thumbnail">
<img src="img/1.jpg" style="height:180px;width:100%;display: block">
</a>
<div class="caption">
<h3>这里是图文标题1111</h3>
<p>这里是描述内容这里是描述内容这里是描述内容这里是描述内容这里是描述内容这里是描述内容这里是描述内容</p>
<a href="#" class="btn btn-primary">开始学习</a>
<a href="#" class="btn btn-info">正在学习</a>
</div>
</div>
<div class="col-md-3">
<a href="#" class="thumbnail">
<img src="img/2.jpg" style="height:180px;width:100%;display: block">
</a>
<div class="caption">
<h3>这里是图文标题2222</h3>
<p>这里是描述内容2222这里是描述内容22222这里是描述内容22222这里是描述内容222这里是描述内容2222</p>
<a href="#" class="btn btn-primary">开始学习</a>
<a href="#" class="btn btn-info">正在学习</a>
</div>
</div>
<div class="col-md-3">
<a href="#" class="thumbnail">
<img src="img/3.jpg" style="height:180px;width:100%;display: block">
</a>
<div class="caption">
<h3>这里是图文标题3333</h3>
<p>这里是描述内容3333这里是描述内容3333这里是描述内容33333这里是描述内容222这里是描述内容3333</p>
<a href="#" class="btn btn-primary">开始学习</a>
<a href="#" class="btn btn-info">正在学习</a>
</div>
</div>
<div class="col-md-3">
<a href="#" class="thumbnail">
<img src="img/4.jpg" style="height:180px;width:100%;display: block">
</a>
<div class="caption">
<h3>这里是图文标题4444</h3>
<p>这里是描述内容4444这里是描述内容4444这里是描述内容4444这里是描述内容4444这里是描述内容4444</p>
<a href="#" class="btn btn-primary">开始学习</a>
<a href="#" class="btn btn-info">正在学习</a>
</div>
</div>
</div>
</div>

.alert {
padding: 15px;
margin-bottom: 20px;
border: 1px solid transparent;
border-radius: 4px;
}
.alert h4 {
margin-top: 0;
color: inherit;
}
.alert .alert-link {
font-weight: bold;
}
.alert > p,
.alert > ul {
margin-bottom: 0;
}
.alert > p + p {
margin-top: 5px;
}
.alert-success {
color: #3c763d;
background-color: #dff0d8;
border-color: #d6e9c6;
}
.alert-success hr {
border-top-color: #c9e2b3;
}
.alert-success .alert-link {
color: #2b542c;
}
.alert-info {
color: #31708f;
background-color: #d9edf7;
border-color: #bce8f1;
}
.alert-info hr {
border-top-color: #a6e1ec;
}
.alert-info .alert-link {
color: #245269;
}
.alert-warning {
color: #8a6d3b;
background-color: #fcf8e3;
border-color: #faebcc;
}
.alert-warning hr {
border-top-color: #f7e1b5;
}
.alert-warning .alert-link {
color: #66512c;
}
.alert-danger {
color: #a94442;
background-color: #f2dede;
border-color: #ebccd1;
}
.alert-danger hr {
border-top-color: #e4b9c0;
}
.alert-danger .alert-link {
color: #843534;
}

<div class="alert alert-success" role="alert">恭喜你操作成功！</div>
<div class="alert alert-info" role="alert">请输入正确的密码</div>
<div class="alert alert-warning" role="alert">你已经操作失败两次，还有最后一次机会</div>
<div class="alert alert-danger" role="alert">对不起，你的密码输入有误！</div>

<div class="alert alert-success alert-dismissable" role="alert">
<button class="close" type="button" data-dismiss="alert">×</button>
恭喜你操作成功！
</div>
<div class="alert alert-info alert-dismissable"role="alert">
<button class="close" type="button" data-dismiss="alert">×</button>
请输入正确的密码
</div>
<div class="alert alert-warning alert-dismissable" role="alert">
<button class="close" type="button" data-dismiss="alert">×</button>
你已经操作失败两次，还有最后一次机会
</div>
<div class="alert alert-danger alert-dismissable" role="alert">
<button class="close" type="button" data-dismiss="alert">×</button>
对不起，你的密码输入有误！
</div>

.alert .alert-link {
font-weight: bold;
}
/*不同类型警示框中链接的文本颜色*/
.alert-success .alert-link {
color: #2b542c;
}
.alert-info .alert-link {
color: #245269;
}
.alert-warning .alert-link {
color: #66512c;
}
.alert-danger .alert-link {
color: #843534;
}

<div class="alert alert-success " role="alert">
<strong>Well done!</strong>
You successfully read
<a href="#" class="alert-link">this important alert message</a>
</div>
<div class="alert alert-info" role="alert">
<strong>Well done!</strong>
You successfully read
<a href="#" class="alert-link">this important alert message</a>
</div>
<div class="alert alert-warning " role="alert">
<strong>Well done!</strong>
You successfully read
<a href="#" class="alert-link">this important alert message</a>
</div>
<div class="alert alert-danger" role="alert">
<strong>Well done!</strong>
You successfully read
<a href="#" class="alert-link">this important alert message</a>
</div>