Home page image

I have currently installed Wallstreet Light.
I searched for this forum and tried several, but I can not solve it so I ask you a question.

1.Home img Size
Please tell me how to lengthen the image like the demo site below.

2.Text on image
Please tell me how to display text on the image like the demo site below.

Demo:
https://webriti.com/wallstreet-free/

3.Images are not compressed in the mobile version.
I tried the following sources.

Theme Dashboard >> Appearance >> customize >> header setting >> custom css filed

A:Not compressed
.page-mycarousel {
background: url(‘http://accurna.com/wp/wp-content/uploads/2018/05/test_img01.jpg’) repeat scroll 0 0 / cover !important;
box-shadow: 0 7px 10px -10px #000;
padding: 365px 0 65px !important;
}

.blog-post-title-wrapper img, .blog-post-title-wrapper-full img{max-width:100% !important; }

Sample screen:
https://www.dropbox.com/s/fd3i5eh33vo5qo8/Mobile_img-size.jpg?dl=0

B:margin
.page-mycarousel {
background: url(‘http://accurna.com/wp/wp-content/uploads/2018/05/test_img01.jpg’) no-repeat scroll 0 0 / contain #880315 !important;
}

Sample screen:
https://www.dropbox.com/s/fvld3pbguar88lh/margin.jpg?dl=0

Thank you