Hi, may I know how to remove / hide the lines element at the background that visible on product pages? You can see the element located between the menu and the product as a background. You may refer to below pages 
Also, if you look at the Size Chart at the single product page, the certain boxes have in grey colour. May I know if you're able to assist on this?
I'm not sure if this related to the Contact Form 7, which the Mobile Number field also in dark grey colour. Please have a look at this page 
http://shop.azura-azwa.com/contact/
Thank you.
                 
                
Comments
to remove shop filters background, you need to use custom css:
.shop-filters { background: none !important; }But we do not understand the 2nd question. Where do you have Size Chart and what wrong you did noticed?.post-nav { background-image: none !important; }We found this table and to remove this grey background, please use:.phoen-wcpsc-product-table tr td:first-child, .phoen-wcpsc-product-table tr:first-child td { background: none !important; }About bolder text in one of your contact form fields, please disable all extra plugins (including cache) but if this won't help, please check the part of code responsible for the form if all tags are opened/closed properly.