.widget.widget_search .form-group,
.widget.widget_search input{
    width: 100%;
}
.widget.widget_search input{
    position: relative;
    padding-left: 23px;
}
.widget.widget_search .search-icon {
    color: #bbb;
    position: absolute;
    top: 10px;
    left: 21px;
}