you can change it in the file _com_cpanel.scss in joomla-cms\administrator\templates\atum\scss\pages in line 127. Change the border color from white to one which can be seen better and fits the design. Or the border could be thicker in order to not have a third forth color in the design

 .cpanel-add-module {
    background-color: var(--atum-bg-light);
    color: var(--atum-text-dark);
    border: 0.125rem **var(--white)** dashed;
    position: relative;
    transition: all .3s ease-in;

In fact the whole "box" is clickable. Why not use the default <a colour and take off its black override and use the same colour for the dashed border?

.cpanel-add-module {
    background-color: var(--atum-bg-light);
    border: .125rem dashed var(--atum-link-color);
    position: relative;
    transition: all .3s ease-in;

This would give:

i think it looks better that way and the text is easier to read

Please test #26872

Closing as we have a patch