How to set style display of an html element in a selenium test?

since you marked jQuery - You can use the css() function to set/get css attributes

$('#id_cv_upload').css('display','inline');

jquery python selenium styles

Finally find out the way to set display of an element.

driver.execute_script("document.getElementById('id_cv_upload').style.display='block';")

basically using driver.execute_script I am executing a java script for setting the style of an element.

jquery python selenium styles

$('#box').css({  background: "#FF0000",  "box-shadow": "1px 1px 5px 5px red",  width: "100px",  height: "100px",  display: "block"});

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