.clear {
    clear: both;
    display: block;
    overflow: hidden;
    visibility: hidden;
    width: 0;
    height: 0
}

.clearfix:before,
.clearfix:after {
    content: '\0020';
    display: block;
    overflow: hidden;
    visibility: hidden;
    width: 0;
    height: 0
}

.clearfix:after {
    clear: both
}

.clearfix {
    zoom: 1
}

.caret {
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 1px;
    vertical-align: middle;
    border-top: 5px solid;
    border-right: 3px solid transparent;
    border-left: 3px solid transparent
}