fix: disallow user zoom out below 75% in safari browser
Created by: weili520
Signed-off-by: TheYoungManLi 1512298456@qq.com
What type of PR is this?
/kind bug
What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes ##1962 (closed)
Special notes for reviewers:
this bug maybe caused by safari zoom mechanism, see more: Safari zoom in/out ruins page layout (doesn't change font-size well)
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