redmine_embedded/assets/stylesheets/doxygen.css

li#searchli {
        width: 0px;
        height: 0px;
}

div#MSearchBox {
    position: fixed;
    margin-top: -2px;
    margin-right: 50px;
}

div#MSearchBox .left
{
    margin-top: -1px;
    height:21px;
}