Hello,

Please add this code to the Theme Settings > Custom CSS > Mobile:

body .woodmart-search-full-screen .searchform{
    padding-right: 62px;
    padding-left: 62px;
}
body .woodmart-close-search{
    top: 30px;
    width: 50px;
    height: 50px;
}
body .woodmart-close-search:after, body .woodmart-close-search:before{
    margin-right: -15px;
    width: 30px;
}

Best Regards