html - Remove the site css For selected div in page -

i'm new css. have page site css(style.css) have basic tag css example

body{color:#c2c2c2}  h2{ color:green;padding-5px } span{ color:blue;border:1px solid #b4b4b4 } 

i need remove css selected div

<div class="remove"><h3>test</h3><span>this sample text css remove</span></div> 

for remove class clear default site css.

you can override global styles.

body{color: red}  h2{ color: green;padding: 5px } span{ color: blue;border: 1px solid black }  /*overriding global styles*/ .remove h2 {color: yellow !important;padding:0 !important} .remove span {color: gray !important;border-color:yellow !important}