Having adapted the solution from this answer , you can reset the style for the element and all its descendants.
.immune, .immune * { animation : none !important; animation-delay : 0 !important; animation-direction : normal !important; animation-duration : 0 !important; animation-fill-mode : none !important; animation-iteration-count : 1 !important; animation-name : none !important; animation-play-state : running !important; animation-timing-function : ease !important; backface-visibility : visible !important; background : 0 !important; background-attachment : scroll !important; background-clip : border-box !important; background-color : transparent !important; background-image : none !important; background-origin : padding-box !important; background-position : 0 0 !important; background-position-x : 0 !important; background-position-y : 0 !important; background-repeat : repeat !important; background-size : auto auto !important; border : 0 !important; border-style : none !important; border-width : medium !important; border-color : inherit !important; border-bottom : 0 !important; border-bottom-color : inherit !important; border-bottom-left-radius : 0 !important; border-bottom-right-radius : 0 !important; border-bottom-style : none !important; border-bottom-width : medium !important; border-collapse : separate !important; border-image : none !important; border-left : 0 !important; border-left-color : inherit !important; border-left-style : none !important; border-left-width : medium !important; border-radius : 0 !important; border-right : 0 !important; border-right-color : inherit !important; border-right-style : none !important; border-right-width : medium !important; border-spacing : 0 !important; border-top : 0 !important; border-top-color : inherit !important; border-top-left-radius : 0 !important; border-top-right-radius : 0 !important; border-top-style : none !important; border-top-width : medium !important; bottom : auto !important; box-shadow : none !important; box-sizing : content-box !important; caption-side : top !important; clear : none !important; clip : auto !important; color : inherit !important; columns : auto !important; column-count : auto !important; column-fill : balance !important; column-gap : normal !important; column-rule : medium none currentColor !important; column-rule-color : currentColor !important; column-rule-style : none !important; column-rule-width : none !important; column-span : 1 !important; column-width : auto !important; content : normal !important; counter-increment : none !important; counter-reset : none !important; cursor : auto !important; direction : ltr !important; display : inline !important; empty-cells : show !important; float : none !important; font : normal !important; font-family : inherit !important; font-size : medium !important; font-style : normal !important; font-variant : normal !important; font-weight : normal !important; height : auto !important; hyphens : none !important; left : auto !important; letter-spacing : normal !important; line-height : normal !important; list-style : none !important; list-style-image : none !important; list-style-position : outside !important; list-style-type : disc !important; margin : 0 !important; margin-bottom : 0 !important; margin-left : 0 !important; margin-right : 0 !important; margin-top : 0 !important; max-height : none !important; max-width : none !important; min-height : 0 !important; min-width : 0 !important; opacity : 1 !important; orphans : 0 !important; outline : 0 !important; outline-color : invert !important; outline-style : none !important; outline-width : medium !important; overflow : visible !important; overflow-x : visible !important; overflow-y : visible !important; padding : 0 !important; padding-bottom : 0 !important; padding-left : 0 !important; padding-right : 0 !important; padding-top : 0 !important; page-break-after : auto !important; page-break-before : auto !important; page-break-inside : auto !important; perspective : none !important; perspective-origin : 50% 50% !important; position : static !important; quotes : '\201C' '\201D' '\2018' '\2019' !important; right : auto !important; tab-size : 8 !important; table-layout : auto !important; text-align : inherit !important; text-align-last : auto !important; text-decoration : none !important; text-decoration-color : inherit !important; text-decoration-line : none !important; text-decoration-style : solid !important; text-indent : 0 !important; text-shadow : none !important; text-transform : none !important; top : auto !important; transform : none !important; transform-style : flat !important; transition : none !important; transition-delay : 0s !important; transition-duration : 0s !important; transition-property : none !important; transition-timing-function : ease !important; unicode-bidi : normal !important; vertical-align : baseline !important; visibility : visible !important; white-space : normal !important; widows : 0 !important; width : auto !important; word-spacing : normal !important; z-index : auto !important; }
Note 1: Button and form controls lose browser-specific style
Note 2: In some cases this will not work. Even if adding a !important rule to a rule gives it a higher priority, another rule (in the original css) may have an even higher priority (for example: another rule with !important )
In this case, you will need to create a specific override
#header { border: 1px solid black !important; } .immune, .immune * { border: none !important; } #header.immune, .immune #header { border: none !important; }
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