Why do I receive the alert that a suspiciously small data fragment has been blocked on Client Security?

@import "/themes/fsecure/design/coveo/CoveoFullSearch.min.css"; @import "/themes/fsecure/design/headerfooter.css"; @media screen and (min-width: 992px){ .helpforums-dropdown:hover, .englishforum li:hover, .finnishforum li:hover, .supportarticles-dropdown:hover, .supportarticles-dropdown a:hover {cursor: default;} .helpforums-dropdown a:hover, .supportarticles-dropdown .languages .second-level li:hover, .supportarticles-dropdown .kbs a:hover, .englishforum li a:hover, .finnishforum li a:hover {cursor: pointer;} .helpforums-dropdown a {width: fit-content} li.second-level {padding:0;margin:15px} li.englishforum > a, li.finnishforum > a {padding:0;margin:25px 0 0 25px} }

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Why do I receive the alert that a suspiciously small data fragment has been blocked on Client Security? - F-Secure Community