html - Make div scrollable no scrollbar -


once again have read many posts on topic none of suggested solutions work. have solution, however, not know why works , appreciate insight.

below solution found on so: hide scroll bar, while still being able scroll

html

<!doctype html> <html lang="en">   <head>     <title>testing</title>     <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>   </head>   <body>     <div class="hidden-xs hidden-sm col-md-3" id="parent">       <div id="child">         test text here       </div>     </div>   </body> </html>

css

#parent {   padding: 0px;   border-width: 1px;   border-style: solid;   height: calc(100vh);   overflow: hidden; }  #child {   width: 100%;   height: 100%;   overflow-y: scroll;   padding-right: 17px; /* increase/decrease value cross-browser compatibility */ }

the above not work me scroll bar remains visible. however, have found property on page parent element "box-sizing" when changed other "border-box" scrollbar disappears , scrolling works expected.

according browser, css comes bootstrap.sass gem.

* {     -webkit-box-sizing: border-box;     -moz-box-sizing: border-box;     box-sizing: border-box; }

my 2 questions are: 1) why case? 2) how turn off in css file?

a scrollbar placed on edge of element's box, should inserted between inner border edge , outer padding edge. space taken scrollbars should taken out of (subtracted dimensions of) containing block formed element scrollbars.

  • the content-box(default is) means element's content box values of it's width property, , width of border or padding added final rendered width.;
  • the border-box means tells browser account border , padding in value specify width , height.

you can add code:

#child {     -webkit-box-sizing: border-box;     -moz-box-sizing: border-box;     box-sizing: border-box; }

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