.ui-datepicker-trigger {
    height: 24px;
    width: 24px;
    margin-left: 2px;
    margin-top: 2px;
    background-color: #416788;
    box-shadow: none;
    appearance: none;
    outline: none;
    border: none;
    color: #fff;
    font-size: 14px;
}

.ui-datepicker-trigger:before {
    font-family: "Glyphicons Halflings";
    content: "\e109";
}