Hello,

First please update theme to the latest version.
Here is video tutorial how to update theme:
https://www.youtube.com/watch?v=KdWESIIPU1k
Don’t forget to make backup your site before updating.
If issue will persist try to disable third-party plugins, maybe one of them caused issue.

With best regards
Brian Johnson

Hello

Sorry we do not support 3-d party plugins. You should contact WMPL plugin support service regarding this issue.

With best regards
Brian Johnson

Hello

You may add similar code into the custom.css with your font uploaded on ftp server:

@font-face {
  font-family: '7fonts.net_FlyingHollander';
  font-style: normal;
  font-weight: 900 !important;color:green!important;
 
  src: url(http://localhost/legenda/wp-content/themes/legenda/css/fonts/7fonts.net_FlyingHollander.ttf) format('otf');}

and add following selector which will overwrite all woocommerce page

.woocommerce{ font-family: '7fonts.net_FlyingHollander'!important;}
You may use following code for tabs as an example:
.woocommerce .tabs{ font-family: '7fonts.net_FlyingHollander'!important;}

With best regards
Brian Johnson

Hello

Following code within Child Theme is cutting webpage layout:

.product {
    height: 275px;
    overflow: hidden;
}

Please describe us it purposes and we would make changes which affect only certain element and not all sigle product pages.

With best reagrds
Brian Johnson

Hello

Please prode us with wp-admin and ftp credentials to yor site.

With best regards
Brian Johnson

Hello

Sorry. We are unable to login. Please check the credentials.

With best regards
Brian Johnson

Hello

Please read here about how to translate our theme.

With best regards
Brian Johnson

You may put this code into the style.css instead of the last one which you showed me as an example:

.fixed-header-area{display:none}

.header-wrapper {position:fixed !important;height: 68px;top:0;border-bottom:2px solid #4BB1A4;  width: 100%;  z-index: 10000;
  background-color: #FFF;
  min-height: 70px;}

With best regards
Brian Johnson

Hello

1.Please put this code into the custom.css to hide it on single product pages only:
.single-product #prefooter{display:none!important;}
2.You may try to add this code to the custom.css:
.single_variation p{display:none}
How to create custom.css you may watch here.

With best regards
Brian Johnson

Hello

Please clear your browser cache and try to reload page because black line is not showing now from different browsers. please check the screenshot(http://i.imgur.com/HusEtrH.png).

With best regards
Brian Johnson

Hello

Please provide us with ftp credentials to let us create Child Theme which contains style.css. You may read here about Child Theme..

With best regards
Brian Johnson

Hello

Sorry we are unable to login to your ftp using the credentials above. Please check them. You may also try to delete and reupload royal/woocommerce folder because it may contain old theme files which cause the issue.

With best regards
Brian Johnson

Hello

Please provide us with ftp credentials to your site.

With best regards
Brian Johnson

Hello

Sorry. We are unable to login to wp-admin panel. Please check the credentials you gave to us.

With best regards
Brian Johnson

Hello

I have edited a bit previously added code in custom.css.
Please check your site now.

With best regards
Brian Johnson