dotfiles/.config/gtk-3.0/effects/overshoot.css

/*
 * disable ripple effects when overscrolling a list
 * and dotted lines when end of list is not reached
 */

overshoot.top,
overshoot.bottom,
overshoot.left,
overshoot.right {
    background: transparent;
    border: none;
}

undershoot.top.
undershoot.bottom,
undershoot.left,
undershoot.right {
    background: transparent;
    border: none;
}