#### Reproduction Use StackBlitz to reproduce your issue: - Components: https://stackblitz.com/edit/angular-eyckbt?file=src/app/dialog-overview-example-dialog.html Steps to reproduce: 1. Just open dialog which contains element with fixed position inside it. #### Expected Behavior Element is positioned correctly when dialog opens. #### Actual Behavior Element jumps from one position to correct one.  #### Environment - Angular: in stackblitz link - CDK/Material: in stackblitz link - Browser(s): Chrome v94 - Operating System (e.g. Windows, macOS, Ubuntu): Windows 10 latest