.bbp-search-form { 
    float: none;
}
#bbpress-forums #bbp-search-form #bbp_search{
    width: 270px;
    margin-right: 26px;
}
#bbp_search_submit{
    min-width: 170px;
    vertical-align: top;
}
div.bbp-breadcrumb {
    float: none;
}
#bbpress-forums div.bbp-search-form {    
    margin: 102px 0 46px;
}
@media (max-width: 767px){ 
    #bbpress-forums div.bbp-search-form {
        float: none;
        margin: 0;
        display: table-footer-group;
    }
}