html - how to make a css border for div -


i used link how set border html div tag make css border div tag.

<!doctype html> <html> <head>  <style type="text/css">      #box{         border: 5px solid black;     }  </style>  </head> <body>      <div id="box">         sign in     </div>  </body> </html>

if put border: 10px; or border-right: 5px solid black; then, there no border. why happen ?

border: 10px; not work because border requires @ least style because there no default style, default color black don't need color. following work

#box {     border: 10px solid; }

border-right: 5px solid black; same border-right: 5px solid; , display, div block element , such takes entire width of container (just @ right side of page)

now if want border directly beside text can turn block element div inline-block element

#box {     display: inline-block;     border-right: 5px solid black; }

also can set each border property individually so

#box {     border-width: 5px;     border-style: solid;     border-color: black; }

or 1 side so

#box {     border-right-width: 5px;     border-right-style: solid;     border-right-color: black; }

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