// Set multiple styles in a single statement
elt.style.cssText = "color: blue; border: 1px solid black";
// Or
elt.setAttribute("style", "color:red; border: 1px solid blue;");
// Set specific style while leaving other inline style values untouched
elt.style.color = "blue";
https://developer.mozilla.org/ko/docs/Web/API/ElementCSSInlineStyle/style