Hello Stella,
Thanks for writing in! Regretfully there is no option in the theme that allows you to change the bottom border color of the product tab. You need to add CSS code into X > Theme Options > CSS to be able to override the default theme styling.
First, you need to use the Google Chrome Developer Toolbar to check the live HTML code and find which CSS selector you need to use. The product tab container use .x-nav-tabs
class and a custom active
CSS class will be added to each tab nav items. The default theme styling CSS is using this:
.x-nav-tabs>li {
border-bottom: 1px solid rgba(0,0,0,.1);
}
Therefore a proper CSS selector for changing the color of the bottom border will be:
.x-nav-tabs>li.active {
border-bottom-color: white;
}
Feel free to add whatever CSS code you like inside the selector. I added a border-bottom-color: white;
to change the bottom border color to white. To learn more about the “border-bottom-color” CSS property, please check this out: https://www.w3schools.com/cssref/pr_border-bottom_color.asp
The points above will be a good starting point and if you are interested you can learn more about CSS selectors and details here
Best Regards.