How can I hide dashed line on tabs?

Hello,

This is my site: My website

I want to hide the dashed lines that appears over the tabs, but just the ones that appears over the tabs.

I know that dashed line is defined here, but If I remove that line in style.css It dissapears from all the template, not only for the tabs.

.items-landscape li:after {
    border-left: 1px dashed #dcdcdc;
    content: "";
    height: 100%;
    position: absolute;
    right: 24%;
    top: 0;
    width: 0;
}

Thanks so much for your help, Daniel.