Is there a way to change background of Matrix field?

Also, is there any way to change background of the "Which services" sheet?

Please Insert the following code 

https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

th.form-matrix-row-headers {

    background-color: #ff0!important;

}

th.form-matrix-column-headers {

    background-color: #ff0!important;

}

td.form-matrix-values {

    background-color: #fff!important;

}

Hope this helps.

Ian,

Thank you that helped! 

Do you know if there is any way I can remove borders in the sheet? 

Also in the mobile version the sheet gets starched and the second raw squished.Could you please help fixing this? 

Appreciate your prompt responses!

1. Do you know if there is any way I can remove borders in the sheet? 

To remove the border, please inject this custom CSS on your form:

td.form-matrix-values {

    border: none;

}

th.form-matrix-row-headers {

    border: none;

}

th.form-matrix-column-headers.form-matrix-column_0 {

    border: none;

}

Result:

2. Also in the mobile version the sheet gets starched and the second raw squished.Could you please help fixing this? 

To fix this, you need to unshrink the field so that it would not look like squished.

Here's the result on mobile view:

Do let us know if you need further assistance.
Regards.

Thank you guys!!!