the css comes with the CDN link
and the css that come with semantic-ui-css package are different.
I am using the css come with package that create problem with modal window.
half of the modal window render out of the winow screen.

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This happens because the newer Version of Semantic-ui-css doesn't use the CSS position: fixed; top: 50%; left: 50%; anymore. Semantic-UI-React however still applies margin-top: -(half-height)px to the .ui.modal-element.
This happens when using Semantic-UI-CSS Version 2.3.X. Forcing version 2.2.12 fixes this problem for now.
Duplicate of #2550
Most helpful comment
This happens because the newer Version of Semantic-ui-css doesn't use the CSS
position: fixed; top: 50%; left: 50%;anymore. Semantic-UI-React however still appliesmargin-top: -(half-height)pxto the.ui.modal-element.This happens when using Semantic-UI-CSS Version
2.3.X. Forcing version2.2.12fixes this problem for now.