css 辅助

.clearfix:before, .clearfix:after {
    content:"\0020";
    display:block;
    height:0;
    visibility:hidden
}
.clearfix {
    zoom:1
}
.clearfix:after {
    clear:both
}
* html .clearfix {
    zoom:1
}
*:first-child+html .clearfix {
    zoom:1
}
.hidden {
    border:0 !important;
    clip:rect(1px 1px 1px 1px);
    clip:rect(1px, 1px, 1px, 1px);
    height:1px !important;
    margin:-1px;
    overflow:hidden;
    padding:0 !important;
    position:absolute !important;
    width:1px
}
.display-block {
    display:block
}
.display-none, .display-hide {
    display:none
}
.bold {
    font-weight:600 !important
}
.border {
    border:1px solid red
}
.inline {
    display:inline
}
.text-right {
    text-align:right !important
}
.text-left {
    text-align:left !important
}
.text-center {
    text-align:center !important
} 
.pull-left {
    float:left !important
}
.pull-right {
    float:right !important
}