How to overcome the dropout of the cursor in the input fields in the modal window on IOS11?

Question

iPhone

How to overcome cursor dropout in Safari modal input fields on IOS11?
Is this a safari bug?
I can't find a proper solution.
Website Arthata.by

Answer 1

When opening a modal window on body, add the class:

.show-modal {
    overflow: hidden !important;
    position: fixed;
    width: 100%;
}

Accordingly, when closing, delete the class