"Help to fix 'blur rendering' in flutter web"

My flutter web is blur at some resolution. Anyone know how to fix it?

For more information, I'm running in debug mode, and when I zoom in or out the page the quality change, some zoom level blur, some not.

enter image description here

[√] Flutter (Channel stable, v1.7.8+hotfix.4, on Microsoft Windows [Version 10.0.17763.615], locale en-US)
• Flutter version 1.7.8+hotfix.4 at D:\flutter
• Framework revision 20e59316b8 (3 weeks ago), 2019-07-18 20:04:33 -0700
• Engine revision fee001c93f
• Dart version 2.4.0

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3) • Android SDK at C:\Users\user\AppData\Local\Android\sdk • Android NDK location not configured (optional; useful for native profiling support) • Platform android-28, build-tools 28.0.3 • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01) • All Android licenses accepted.

[√] Android Studio (version 3.4) • Android Studio at C:\Program Files\Android\Android Studio • Flutter plugin version 37.1.1 • Dart plugin version 183.6270 • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01) [√] VS Code, 64-bit edition (version 1.36.1) • VS Code at C:\Program Files\Microsoft VS Code • Flutter extension version 3.3.0 [!] Connected device ! No devices available