CSS percentage position minus a pixel -

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is there way following in plain css?

.item {     width: 85% - 1px; }

in other words, want item 85% width, minus 1 pixel (ignore border).

how accomplish this?

there css calc function.

https://developer.mozilla.org/en-us/docs/web/css/calc

in case, this

width: calc(85% - 1px);

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