Backdrop doesn't cover entire of screen

[memcaliber]

Describe the bug

Hi.. i try this version on my nextJS theme. all function works fine, but when alert appears, the black background/backdrop doesn't cover entire of screen/page area. my sidebar menu not covered at all.

[limonte]

Swal.fire({
  ...
  customClass: {
    container: 'custom-z-index',
  }
})

.custom-z-index {
  z-index: 9999; /* z-index is 1060 by default, for your project make it bigger than z-index of sidebar */
}