标准bootstrap3 form表单美化
/*文本框美化*/
.form-control[type='text'], .form-control[type='password'] {
padding-left: 20px;
}
.form-group:last-child label:before {
position: absolute;
left: 20px;
top: 36px;
z-index: 9;
width: 0;
height: 0;
display: block;
border-left: 8px solid #337ab7;
border-top: 6px solid transparent;
border-bottom: 6px solid transparent;
content: "";
}